Key takeaways
- Most prep centers charge a base rate per unit, then add line items for labels, bags, bubble wrap, cartons and pallets.
- The type of inventory matters most: clean wholesale loads cost far less per unit than mixed arbitrage.
- In our worked example, 600 wholesale units with labels, some bagging and one pallet come to roughly $1.16 to $1.21 a unit.
- Storage, oversize items and messy inbound shipments are where surprise charges usually come from.
Why FBA prep center cost is hard to compare
Ask five warehouses for their FBA prep center cost and you'll get five answers that don't line up. One quotes a flat number. Another lists a base rate and fifteen add-ons. A third says "depends." (It does depend. That answer just isn't very useful.)
So instead of guessing at industry averages, we'll do something more practical. We'll walk through how prep gets priced, line by line, using our own posted rates at Treasure World Prep Center in Niles, IL. Then we'll run a hypothetical shipment through it so you can see where the money goes.
Your numbers will differ from ours. The structure, though, shows up almost everywhere.
So, how much does FBA prep cost per unit?
The base rate is the per-unit charge for receiving your inventory, doing a basic check and handling each unit. It's the biggest line on most invoices, and it swings a lot depending on what kind of inventory you send.
- Wholesale / private label, 20-500 units
- $0.70/unit
- Wholesale / private label, 501-2,500 units
- $0.60/unit
- Wholesale / private label, 2,501-5,000 units
- $0.50/unit
- Wholesale / private label, 5,001+ units
- $0.40-$0.45/unit (custom quote)
- Online arbitrage, 1-500 units
- $1.50/unit
- Online arbitrage, 501-2,500 units
- $1.15/unit
- Online arbitrage, 2,501+ units
- $0.95-$1.05/unit
- Retail arbitrage / mixed retail
- $1.75/unit
Why the gap? Wholesale and private-label loads are usually the same few SKUs in clean factory cartons. Open, count, label, repack. Online arbitrage is the opposite: a dozen retailers, random packaging, one or two of each item. Retail arbitrage adds clearance stickers, security tags and mixed conditions on top of that.
More touches per unit, higher rate. That's really the whole logic of prep center pricing.
The add-ons that change your total
This is where two quotes with the same base rate end up far apart. On our table, these are separate lines:
- FNSKU or marketplace label: $0.35-$0.40 per unit (you supply the label file digitally)
- Extra carton label: $0.20 each
- Sticker or price-tag removal: $0.25 per unit
- Poly bags: $0.30 small, $0.40 medium, $0.50 large, per unit
- Bubble wrap: $0.60-$1.25 per unit
- Oversize or overweight handling: +$0.75 to $3.00 per unit, tiered by weight and dimensions
Labels are the one almost everybody pays. Bags and wrap depend on the product (and on what Amazon currently asks for, which you should confirm in Seller Central). Sticker removal mostly hits arbitrage sellers.
Oversize is the sneaky one. A big, heavy item takes more space and more hands, so the surcharge can end up bigger than the base rate itself.
Cartons, pallets and shipment paperwork
Units go to Amazon inside cartons, and bigger shipments go on pallets. Each of those steps has its own price.
Case pack or master carton builds are $5 a carton plus materials, and complex repacks get quoted separately. Palletization for FBA is $30 a pallet plus $1 per carton. Strapping, when it's required, adds $25 to $30 a pallet. If you want us to handle the FBA shipping plan, that's $5 per shipment (and it may be included on qualifying volume).
Small parcel shipments skip the pallet charges entirely. Whether a shipment goes small parcel or pallet is something to decide with your prep team before inventory arrives, since it changes both the prep work and the freight.
A worked example: 600 wholesale units
Hypothetical, but realistic. Say you're a private-label seller sending 600 units of one product from your factory. The units need FNSKU labels. 200 of them are a variant that needs a medium poly bag. Everything goes out to Amazon on one pallet in 12 cartons, and you'd like us to handle the shipping plan.
- Base prep, 600 units at $0.60
- $360.00
- FNSKU labels, 600 at $0.35-$0.40
- $210.00-$240.00
- Medium poly bags, 200 at $0.40
- $80.00
- Palletization, 1 pallet + 12 cartons
- $42.00
- Shipping-plan admin
- $5.00
- Estimated total
- $697.00-$727.00
That works out to roughly $1.16 to $1.21 a unit. Notice that the base rate is only about half the bill. Labels and bags are the other big chunk, which is why comparing prep centers on the headline rate alone doesn't tell you much.
Now flip it. If those same 600 units came in as online arbitrage, the base line alone would be $1.15 a unit ($690) before labels. Add sticker removal on half of them and the total climbs fast. Same unit count, very different invoice.
Real shipments also pick up things like inspection extras or problem receiving, so treat this as a rough estimate, not a quote.
Storage: the part of FBA prep center cost people forget
If your inventory goes straight through to Amazon, storage might never show up. But plenty of sellers keep overflow at the prep center and send it in waves, and that has a monthly cost.
On our side, a standard pallet (up to 72 inches) is $35 a month, and box or bin storage runs $4 to $6 a month. Inventory that sits a long time costs more: 1.25x the base storage rate from 91 to 180 days, and 1.50x after 181 days. That's normal across warehousing. Slow stock takes up space that could hold something moving.
We go deeper on all of this in our post on how much a 3PL charges, which covers storage and fulfillment pricing beyond FBA prep.
How to keep your FBA prep center cost down
A few habits that make a real difference:
- Have your supplier ship clean, consistent cartons with a packing list
- Send FNSKU labels with the work order, not after the inventory lands
- Batch shipments so you land in a higher-volume tier
- Ask your supplier to skip retail stickers if you don't need them
- Don't park slow movers in storage for months
Most of these just reduce how many times a unit gets touched. Fewer touches, smaller bill. If you're new to prep centers in general, start with what an FBA prep center does and come back to the numbers after.
Want an actual estimate? The full rate table is on our pricing page, the service details are on the Amazon FBA prep page, and you can request a quote with your product, unit count and packaging needs. We're in Niles, IL, and inventory from anywhere can ship to us.
