How to Choose an FBA Prep Center: Nine Questions and the Answers That Should Worry You

Pull one real SKU off the shelf before you dial. Actual dimensions, actual packaging, the case pack it arrives in, and the quantity you move in a month. Every prep center website says the same four things: fast turnaround, competitive per-unit rates, experienced team, real-time visibility. Those four claims describe what every prep center does, not how this one does it. You cannot pick a warehouse from that page. You can pick one from a twenty minute phone call about a product that exists.

The call carries more weight than it used to. Since January 2026 Amazon no longer preps or labels US FBA units for a fee, so every FNSKU on every unit gets printed and applied by somebody on your side of the dock. The end of commingling handed that job to the seller for good. Whoever preps your inventory is the last set of hands that can catch anything.

The call takes about twenty minutes, and it tells you who you are dealing with as long as every question forces a specific answer instead of more brochure.

Before you dial

What separates a useful call from a pleasant one is what you settle before you dial.

• Ask everything about the SKU in your hand at its real monthly quantity. Generic questions get generic answers, and a rate quoted on an average unit is not a rate.
• Ask for the person who will run your account day to day, not only the one who picks up the sales line.
• Write down the exact words you hear. Ambiguity on a call becomes a line on an invoice later.
• Ask for the master service agreement and the full fee schedule as documents on the first call, before you like anybody.

Walk me through one carton, from my supplier’s truck to Amazon’s dock

A good answer. The person walks the route in order, naming systems and physical places along the way. The truck is unloaded against your packing list, cartons are counted and photographed when anything looks crushed, whatever does not match goes to a marked hold area instead of back onto the line, each SKU gets a work order stating which prep it needs, a second scan confirms the applied label reads, box content is captured during pack out, and the outbound goes onto a bill of lading with a delivery appointment already booked.

Listen for the scan events. Every point where a barcode gets read is a timestamp you can pull back later. If the narration skips something, ask for these five directly:

• where a discrepancy physically goes, and who gets told
• which document tells the operator what prep this SKU needs
• whether a label is verified by a second scan after it is applied
• at what point box content information is captured
• who books the delivery appointment, and in whose carrier account

Box content, the pallet spec and the last look before the truck loads are a subject of their own (the pre-shipment checklist). Here you only need to hear where each one happens inside their building.

A bad answer. “We receive it, prep it, and it goes out in a couple of days.” Any narration with no hold location, no work order and no verification scan describes a process living inside one person’s head.

At volume. At low volume the owner remembers your carton. Across a long SKU list the only witness is the scan trail, and when Amazon opens a case, memory is not evidence. Timestamped photos are.

Who builds the shipment plan, and who owns the placement decision?

A straight operator states plainly who does what. Either they work inside your Seller Central through a secondary user account with scoped permissions, or you build the plan and hand it over. Then they explain the split, because Amazon prices inbound placement by how your inventory is distributed across the network, and accepting the recommended multi-destination split or asking for the fewest destinations are two different costs per unit. Someone who does this daily knows the ship-from address feeds that calculation and that pallet shipments carry their own eligibility rules, and can pull the current placement charges up while you are still on the phone.

“We send it wherever Amazon tells us” is the answer to write down. It is not wrong, it is just not a decision. Watch too for the center that always consolidates to a single destination because it keeps their dock simple, and never mentions what that adds per unit.

This is one small decision repeated tens of thousands of times a month, so the default matters far more than the exception. Appointment discipline belongs in the same answer: duplicate appointments, freight delivered to the wrong building and no-shows all count as delivery defects against the carrier.

Can I see a label you printed last week?

Ask for a photo rather than a description, and expect it inside the hour. Black on white, thermal printed on non-reflective stock with removable adhesive, applied flat and well away from seams, corners and curves, manufacturer barcode fully covered, clear space on both sides of the code. Then one follow-up about print settings, since a label file that gets resized before printing produces a barcode that still looks fine to a human and fails on the receiving line. Hold their photo up against what Amazon asks of an FNSKU label before you decide it looks fine.

The answer that ends this topic is “we print them on a regular office printer, they scan fine.” So is a photo showing glossy stock, a label bent over an edge, or a label crossing the seam of a box so it tears the moment the box opens.

Labeling failures are rarely one-off mistakes. They are settings: a wrong printer or a scaled template fails for a whole run, not for one unit. If you sell Transparency-enrolled items, ask separately how serialized codes get handled, since an unreadable one holds the unit at the fulfillment center.

What happens when a unit does not match its prep instruction?

There should be a named path, and a practitioner walks it without hedging: the line stops, the unit is photographed, it goes to a hold location, and you get a message on a defined channel inside a defined window. They will ask up front for standing instructions on low-cost cases, because nobody wants an email about a scuffed box on a cheap item. They can usually say roughly how many received units become exceptions and how that number is measured.

“We would give you a call” leaves out the number, the window, and what happens to the rest of the pallet meanwhile. The worse version is “we use our best judgment,” which means somebody you have never met decides whether a dented unit ships to Amazon under your seller account.

Exceptions grow faster than volume does, especially for sellers buying from mixed sources. Fifty open exceptions sitting in a shared inbox is a stalled shipment plan plus storage charges. Ask whether the storage clock keeps running while they wait on you, and whether one held unit stalls its whole shipment plan.

What is not included in the per-unit rate?

A center with nothing to hide names its own splits before you go looking for them. Receiving, poly bagging, bundle labor, oversize handling, storage past the free window, building the shipment plan, pallets and freight all sit somewhere, and centers differ honestly in which of them are folded into the base rate. The tell is whether they price your actual product instead of an average unit, since dimensions and weight move nearly every line. Ask when the free storage window starts and how it is measured, because that is the line that turns up on the second invoice.

The version to walk away from is one number for prep, no written fee schedule and a promise to sort the details out once the first container lands.

Whatever arrives, read it against a schedule that names every line separately. The rates we publish are laid out that way on purpose, and a proposal you cannot compare line for line is not yet a quote. Lining two of them up is its own job. A quote reads differently once you know which lines the per-unit number usually swallows and which ones always arrive on top. What you want off this call is narrower, the complete fee schedule in writing, today.

Which of my categories are you actually allowed to hold?

A center worth hiring asks what you sell before it answers. Aerosols, flammables, lithium cells, some cosmetics and cleaning products are governed by fire code, permits and control area limits inside the building, not by whether a warehouse feels like handling them. An operator who stores this class knows which permits the building holds and where its ceiling sits.

Amazon counts your inbound capacity separately by storage type as well, with standard size, oversize and special categories such as apparel, footwear, aerosol and flammable measured on their own, and room in one type does not move to another. Aging stock eats into that same number through storage fees that climb the longer a unit sits, which is a separate problem from permits and lands on the same catalog.

“We handle everything” is where the call gets short. Nobody handles everything, and the answer you want has a refusal somewhere in it. A mixed catalog is where this lands hardest: one battery-powered item or one aerosol inside an ordinary purchase order can strand a pallet at a center that cannot legally hold it, and you learn that on receiving day. Look up the classification of anything regulated in your catalog before the call, so you can hear whether the answers are real.

What does your system show me, and can I get my data back out?

Ask them to share a screen before you sign anything. On-hand by SKU, receiving records with photos attached, work order history, and an export that produces a file rather than a screenshot. Ask who owns the reconciliation when their count and Seller Central disagree.

Spreadsheets emailed on request, a portal launching next quarter, and no export at all are three versions of the same answer: your operating history belongs to them.

You will be reconciling three numbers every month, what your supplier shipped, what the center received, and what Amazon checked in. Reimbursements for lost or damaged FBA inventory now run on manufacturing cost and want supplier documentation behind them, so a receiving record and a photo produced the same day is the difference between a paid claim and a written-off one. That pair of records is also the first thing you reach for when a shipment comes back refused or short.

If a case is destroyed in your building, what do I get back?

The cap should come up before you ask for it. Most warehouse agreements limit liability for lost or damaged goods to a figure tied to weight, and a straight operator points at the clause and reads it to you. They carry warehouse legal liability coverage, which responds to their own negligence, and they say outright that you should hold your own all-risk coverage on inventory.

“We are fully insured” carries no information at all. The contract cap controls what you can recover, not the policy limit behind it.

At volume. A weight-based cap is fine for furniture and brutal for anything small and expensive. Supplements, electronics accessories and cosmetics are the classic cases: a pallet worth a lot of money weighs very little, so the cap and the loss sit nowhere near each other. Work that gap out on your own catalog, and if it is wide, ask whether the cap can be raised for named SKUs or whether your cargo policy has to cover it.

What happens to my inventory the day I decide to leave?

Almost nobody asks this on a first call, and it decides how the relationship ends. What you want to hear is a notice period, an outbound process, a stated cost for pulling and palletizing whatever is left, a policy for half-prepped units, and a willingness to release inventory to another warehouse rather than only to Amazon. Centers that have done this before quote a timeline without hesitating.

“That has never come up” is untrue, it has. Equally worrying is no termination clause at all, which sounds flexible and means the terms get written during the argument.

Learn the legal shape of this before you need it. US warehouse law lets a warehouse assert a lien on goods it stores when storage and handling charges go unpaid, and whether that lien reaches only the goods the charges relate to or your other stock in the building depends on the wording of the storage agreement. Read that clause. It is ordinary commercial law, and it is why a billing dispute during an exit is the worst position a seller can be in.

Get this in writing before the first pallet arrives:

• the notice period for termination and the form the notice has to take
• who pays to pull, pack and palletize your remaining inventory
• what happens to units caught half prepped when you leave
• whether they will release stock to a carrier you choose, and on what terms

Red flags that end the call

Some answers do not deserve a follow-up question.

What you hear	Why it is a problem	Ask this instead
“We handle every category.”	Permits, control areas and Amazon storage types all say otherwise.	Which classes are you permitted to store, and which do you refuse?
“We never make mistakes.”	Nothing is being measured, so nothing gets corrected.	How do you count defects, and what was last month’s number?
“Rates are per unit, we will work out the extras later.”	The extras are the invoice.	Send the complete fee schedule today, in writing.
“Send the pallets, we will figure out the prep when they land.”	Prep specs get decided per SKU before receiving, not on the dock by whoever cuts the shrink wrap.	How does a prep instruction get recorded against a SKU before my first shipment?
“No contract needed, we are flexible.”	No liability terms, no notice period, no service levels, nothing to point at.	Send the master service agreement and the service level terms.
“Just give us your Seller Central login.”	Amazon supports secondary users with scoped permissions for a reason.	Which permissions do you need, and under which user account?

The batch that settles it

No phone call replaces one real batch. Send a small purchase order of a SKU you know well, pay the standard rate, and measure four things: the gap between arrival and the receiving report, how many units landed as exceptions, whether the label photos match what you asked for, and whether the invoice matches the quote line for line. Then watch how they behaved: who answered mid-run, how fast, and whether anyone flagged a problem before you found it. A center that stumbles on a small batch will not improve at scale.

Sticking points

How many centers should I compare, and how fast should I move?

Three is enough, and four is where the calls blur together. Compare them on the same SKU at the same monthly quantity, and make sure at least two of the three handle your hardest category rather than only your easiest. Once you pick one, move a single product line first and leave the rest where it is for a full replenishment cycle. Splitting inventory costs a little efficiency and buys you an exit that does not involve panic.

Does the center need to be near me, or near Amazon?

Near Amazon, and near where your freight lands. Your drive time matters once, on a tour. What repeats weekly is the distance from the prep floor to the fulfillment centers your inventory gets routed to, and how close the building sits to your import port. That is why so much East Coast volume runs through northern New Jersey.

Who pays when Amazon charges a fee for something the center got wrong?

Whatever the contract says, which is usually nothing unless you raise it. Ask whether they credit defect fees traceable to their work, what evidence they need, and how long you have to file. Answers run from a full credit to nothing, and any of them can work once you know which one you signed.

Does storing inventory in another state create tax obligations?

It can. In most states, inventory sitting in a third-party warehouse counts as physical presence and creates sales tax nexus there whatever your sales volume into that state, and states do ask warehouses whose goods they hold. Take it to your accountant before you pick a location.

What you are actually buying

The rate is the easiest thing to compare and the smallest thing on the table. What you take on is somebody’s process, their record keeping and the contract you both sign. Centers worth working with answer all nine questions in one call, and they raise the awkward parts, the liability cap and the exit terms, before you get there yourself.

To run the same nine questions at us, start with what our FBA prep service covers and bring a real SKU to the call.