The first time we handed inventory to a prep center it felt like losing control. The second time it felt like getting the garage back. We have not touched our own stock in years, and that is what lets us run an Amazon business from another country.
In 2026 the question stopped being optional. Amazon ended its own prep and labeling service at US fulfillment centers on January 1 and at Canadian ones on July 1. Every unit now has to arrive bagged, labeled, and compliant, and someone has to do that work: you, your supplier, or a prep center.
What a prep center actually does
A prep center is a warehouse that receives your inventory, makes it FBA compliant, and ships it into Amazon. The menu: count and inspect cartons, apply FNSKU labels, poly bag with the suffocation warning, bubble wrap anything fragile, bundle multipacks, build the shipment in Seller Central, label the boxes, and hand them to the carrier. Most offer short-term storage and handle returns and removal orders. Your suppliers ship to them, not to you.
What it costs in 2026
US prep centers typically charge 40 cents to a dollar per unit for standard prep: receiving, an FNSKU label, a poly bag, and the carton label. Two Canadian rate cards we pulled this fall: Red Hat Prep in Milton, Ontario lists 69 cents per item with no minimum, and FBA Prep AB in Calgary tiers from $1.50 per unit under 500 units a month down to 80 cents above 2,000, plus GST. Arbitrage stock usually adds 40 to 50 cents a unit, and storage runs about 50 dollars a pallet after a free window.
Treat those as one day's numbers. Rate cards move, but the shape holds: a per-unit base, add-ons for anything fiddly, and storage if stock sits. All of it lands on top of the Amazon seller fees you already pay.
Prep center vs prepping yourself
Materials are cheap, 5 to 30 cents a unit. Labor is the real cost. A practiced person handles 40 to 80 simple units an hour, so a 500-unit shipment is a full day at the table. Price your hours at part-timer wages and the math usually flips somewhere between 50 and 150 units a month. Below that, prep at home and keep the margin. Above it, you are paying yourself warehouse wages to dodge a 70-cent fee.
The spreadsheet misses two things. A missing label or an open bag draws per-unit problem fees, pennies to several dollars each, and with Amazon's own service gone nobody on the dock will fix it. And a prep center lets you source anywhere. We buy in one country, prep in another, and sell in a third, which does not work if every box has to come to your door.
How to pick one
- Location. Near a carrier hub, on the same side of the border as the marketplace it feeds. Crossing once by freight beats crossing parcel by parcel.
- Turnaround and Q4. Ask for average days from receiving to shipment created. Smaller centers often ship once a week, and some cap intake from October to December.
- Access and proof. They work through a limited user permission, never your login, and send receiving photos and counts on arrival. That is how you audit from 3,000 kilometers away.
- The full rate card in writing, including storage, returns, removal orders, and any arbitrage surcharge, plus references from other sellers.
Then write the handoff down. Our SOP post shows how we document a process so a prep center or a VA can run it without us.
The Canadian angle
Most Canadian sellers feed two marketplaces, so this is two decisions. For Amazon.ca, the deepest bench is around Toronto and Montreal, with Calgary, Edmonton, and Vancouver out west. For Amazon.com, Amazon will not move Canadian FBA stock to American buyers, so that inventory has to land in the US first. A US prep center, or a Canadian one with a cross-border forwarding service, is the usual answer.
When you import from overseas the prep center is often the delivery address, which raises who the importer of record is and how the import GST gets recovered. The freight side is in our freight forwarding post. The accounting side sits with our firm, Jones and Cosman, in their customs clearance guide for Amazon sellers.
Frequently asked questions
Is a prep center worth it for a small seller?
Under about 50 units a month, usually not. Prep at home and revisit once a shipment eats a full day. The exception is a seller who travels: if you are not home to receive boxes, the fee is the price of leaving.
What are the best prep centers for Canadian sellers?
There is no neutral ranking, only directories run by software companies. Shortlist two or three near your main supplier, get written rate cards, then test with one small shipment before you commit a pallet.
Can my supplier do the prep instead?
For private label, yes, and at roughly 10 to 25 cents a unit it is the cheapest route. Send the FNSKU file and the packaging spec and inspect the first batch hard. It does not work for arbitrage or most wholesale, where goods arrive in retail packaging.
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