How FBA 3PL pricing is structured
FBA 3PL pricing is usually built from activity-based charges: you pay for receiving, storage, prep, building outbound shipments and freight, plus any account or technology fees. Each charge is tied to a unit of work, such as a carton received, a pallet stored for a month or a unit labeled.
This structure means two quotes with very different headline rates can end up close in total, or far apart, depending on your product and order profile. The only reliable comparison is a modeled month using your own volumes. Below are the main cost categories to understand before you build that model.
Receiving and inbound handling
Receiving covers unloading, counting and putting away your inbound inventory. Floor-loaded containers are typically priced per container or per hour because devanning loose cartons is labor-intensive, while palletized freight is often priced per pallet. Parcel receipts may be priced per carton.
Watch for extra charges tied to inbound quality: cartons without labels, mixed SKUs in one carton, inaccurate packing lists or damaged pallets usually add labor. Ask your supplier to follow a carton labeling and packing spec, and ask the 3PL how exceptions are billed. Clean inbound is one of the easiest ways to reduce total cost.
Storage
Upstream storage is usually priced per pallet per month, per bin or shelf location, or by cubic foot. Pallet pricing suits bulk container inventory; bin or shelf pricing suits smaller quantities and loose units for DTC orders.
When comparing, check how a pallet is defined, including maximum height and weight, and whether partially used pallet positions are billed as full. Ask about special storage, such as climate-controlled or hazmat-capable space, which is priced differently and available only in some markets. Compared with FBA storage, upstream storage pricing usually has no seasonal spike tied to Amazon's calendar and no aging surcharges tied to Amazon's rules.
Prep and value-added services
Prep is often the largest variable cost in an FBA 3PL relationship. Typical charges include FNSKU labeling per unit, polybagging per unit, bubble wrap per unit, bundling or kitting per kit, expiration-date labeling and carton relabeling. Some 3PLs bill prep per unit by type; others bill by labor hour.
Compare prep pricing using your real prep mix. A provider with a low labeling rate but a high polybag rate may cost more if most of your SKUs need bags. Also ask whether materials such as bags, bubble wrap and labels are included or billed separately. If your factory can apply FNSKUs at the line, the 3PL's prep cost drops, but you still want inspection on arrival.
Outbound shipments and freight
Outbound costs cover building replenishment shipments for FBA: picking cartons or units, packing master cartons, applying FBA carton labels, submitting box content information and building pallets for LTL. These are often priced per carton or per pallet, sometimes with a per-shipment fee.
Freight is separate. Small-parcel and LTL freight into Amazon can be booked through Amazon's partnered carrier options in Send to Amazon or through the 3PL's own carrier accounts. Remember that freight interacts with the inbound placement fee: shipping to more destinations may cost more freight but avoid a fee. For DTC orders, pick-and-pack fees per order and per additional item, plus packaging and postage, apply.
Account and technology fees
Many 3PLs charge a monthly account management fee or minimum, and some charge for integrations, onboarding or special reporting. Minimums matter most for smaller sellers: if your activity charges fall below the minimum, you pay the minimum anyway.
Ask what is included: inventory reporting, replenishment planning, placement-option analysis and discrepancy documentation can be part of the service or billed separately. A provider that includes planning may cost more per month and still save money by preventing stockouts and fees.
Building a fair comparison
To compare a 3PL with Amazon-only storage, build both sides of the ledger for a typical month.
On the Amazon-only side, include FBA monthly storage fees for your average inventory, any storage utilization surcharges, aged-inventory surcharges, low-inventory-level fees when stock runs thin, inbound placement fees, and freight from the port or factory straight to Amazon. Add the cost of stockouts when capacity limits block inventory, even if it is an estimate.
On the 3PL side, include receiving, upstream storage, prep, outbound shipment building, freight into Amazon, account fees, and the smaller FBA storage and placement fees that remain for the inventory still at Amazon. Compare the totals per unit sold, not per unit stored.
Hidden costs that change the math
Some costs never appear on a rate card but still belong in the comparison. Stockouts are the biggest. When a listing runs out, you lose the sales for those days and often lose ranking that takes additional ad spend and time to recover. Even a rough estimate of lost margin per stockout day helps put fees in perspective.
Noncompliance is another. Prep or labeling errors can lead to refused units, rework charges or inventory that Amazon cannot sell until it is fixed. Box content errors can trigger manual processing fees and slower receiving. A provider with a strong prep process may charge more per unit and still cost less overall.
Then there is your own time. If you are building every shipment, chasing receiving discrepancies and reconciling inventory across channels yourself, that labor has a cost even when it does not show up as an invoice. Count it, because one of the main reasons sellers move to an FBA 3PL is to get those hours back for product, marketing and growth.
Questions to ask before you sign
Before you sign, ask for a written rate card covering every service you will use, a sample invoice for a seller with a similar profile and a clear list of what triggers extra charges. Ask how often rates change and how much notice you get.
Also ask who pays when an Amazon charge results from the 3PL's error, such as a prep noncompliance fee or a mislabeled carton. Clarity here avoids disputes later. A trustworthy provider will give you transparent pricing and help you model your own numbers, and should be able to turn around a custom quote quickly once it has your data.
Frequently asked questions
Is an FBA 3PL cheaper than storing everything at Amazon?
Often, for sellers with bulk imports, multi-channel sales or regular capacity constraints. Compare total monthly cost per unit sold, including Amazon surcharges and stockout costs.
What is usually the biggest cost with an FBA 3PL?
Prep and handling are often the biggest variable costs, followed by storage and freight. The mix depends on how much prep your products need and how they arrive.
How can I lower my 3PL costs?
Send clean, well-labeled inbound freight, have the factory apply FNSKUs when reliable, right-size replenishment shipments and reduce packaging volume where allowed.