Prep centers made sense when you were new, when your volume was low, and when you did not yet have the manufacturer relationship to handle compliance at the factory. At that stage, they solve a real problem. The issue is that most brands stay in that stage long after they should have moved on.
A prep center is a bridge. Every dollar you pay a prep center at scale is a dollar you are paying because you have not yet built a more efficient supply chain. That is not a permanent solution — it is a temporary one that too many brands make permanent.
Here is how we think about it.
What Prep Centers Actually Do
An FBA prep center is a third-party facility that receives your inventory — typically direct from your manufacturer or supplier — and performs the labor-intensive compliance work before forwarding to Amazon fulfillment centers. Standard prep center services include:
- FNSKU labeling on individual units
- Poly bagging and suffocation label application
- Bundle assembly and multi-pack preparation
- Carton labeling and shipment plan compliance
- Quality inspection and unit count verification
- Forwarding to Amazon FBA as a compliant inbound shipment
Pricing is typically per-unit for basic prep services — often $0.50 to $2.00+ per unit depending on the prep required — plus receiving fees, storage fees for inventory awaiting prep, and forwarding costs. Those fees add up fast at volume.
When Prep Centers Make Sense
There are legitimate use cases for prep center services. The key is using them with intention rather than by default.
Early-stage brands with limited volume
When you are shipping 200 units per month, you do not have the volume to justify asking a manufacturer to apply FNSKU labels at the factory. You do not have leverage in that conversation, and the manufacturer may not have the process to do it reliably. A prep center is a practical answer at this stage — it solves the compliance problem without requiring a manufacturer relationship that is not there yet.
The calculus changes when volume crosses a threshold. For most products, when you are moving 500+ units per month per ASIN, the direct-to-FBA math starts to work. When you are moving 2,000+ units per month, continuing to pay a prep center is often a significant and unnecessary cost.
Products with complex bundling or kitting
Some products require assembly, multi-pack configuration, or bundling that is genuinely difficult to perform at the manufacturer level — particularly if you are sourcing components from multiple suppliers. In these cases, a prep center that specializes in assembly and kitting is a legitimate supply chain node, not just a workaround. Evaluate the cost versus the alternative (assembling in-house, building your own 3PL relationship, or engineering the bundle to be manufacturable at the factory).
Domestic sourcing situations
If you are sourcing from U.S. manufacturers or using domestic suppliers, a prep center may be the most practical way to handle Amazon compliance work without building your own fulfillment infrastructure. This is more common in regulated categories, food products, or brands that have made a deliberate domestic sourcing choice. The economics are different from import-based supply chains.
Hazmat and regulated product handling
Some products require special handling — batteries, certain chemicals, items with regulatory compliance requirements that Amazon will not accept without specific certification or labeling. A prep center that specializes in these categories can handle the compliance requirements more efficiently than a general-purpose manufacturing facility, particularly for smaller brands.
When to Move Beyond Prep Centers
At scale, the prep center fee structure is a drag on margin. Here is how to think about the transition:
When FNSKU application can move to the factory
This is the most common and highest-leverage shift. If you are sourcing from a single manufacturer and moving consistent volume, you have the leverage to ask them to apply FNSKU labels at the factory — either as part of the standard production process or at a modest per-unit cost that is almost always less than what a prep center charges.
What this requires: a stable manufacturer relationship, consistent volume to justify the manufacturer's investment in the process, reliable label file delivery for each production run, and a quality control process to verify compliance before goods leave the factory. The factory photo verification step we use on every China-to-FBA shipment is exactly this quality control layer.
Brands that make this shift typically save $0.50 to $1.50 per unit in prep fees and eliminate the 5–15 day prep center processing delay from their lead time. On a brand moving 5,000 units per month, that is $2,500 to $7,500 per month in savings and a meaningfully faster inbound cycle.
When volume justifies direct-to-FBA inbound
Beyond FNSKU labeling, the full shift to manufacturer-direct-to-FBA routing eliminates the prep center receiving, handling, and forwarding fees entirely. Your freight forwarder delivers directly to Amazon fulfillment centers from port. No intermediate stop. No prep center storage fees accumulating while your inventory waits.
This requires your manufacturer to handle carton marking and shipment plan compliance correctly, and it requires a freight forwarder who knows how to deliver to Amazon FCs. Both of those are achievable with the right partners and processes — and both are things we build for brands as they scale.
When lead time matters as much as cost
Every day inventory sits at a prep center is a day it is not in Amazon's fulfillment network contributing to your sales velocity and inventory performance metrics. Amazon's IPI score (Inventory Performance Index) is partially influenced by how efficiently you maintain in-stock rates relative to demand. Prep center delays create IPI risk during peak demand periods. Direct-to-FBA eliminates that risk by cutting 5–15 days of lead time from your inbound cycle.
The Cost Comparison You Should Actually Run
Before deciding whether to stay with a prep center or build a direct-to-FBA supply chain, run the honest cost comparison. Per unit:
- Prep center: receiving fee + prep fee per unit + storage fee per day awaiting prep + forwarding cost
- Direct-to-FBA: incremental manufacturer cost for factory labeling (often $0.05–$0.20 per unit) + any additional freight forwarder coordination cost
For most brands at meaningful volume, the prep center cost per unit is 3x to 10x the cost of factory-applied labels. The savings are real and recurring. The primary obstacle is the setup work: training the manufacturer, establishing a QC process, and finding the right freight forwarder. That setup work is a one-time investment. The savings are permanent.
What OBG Actually Does With Clients
When we take on a new brand that is using a prep center, our first question is: at what volume does it make sense to move toward direct-to-FBA? We answer that with the actual unit economics, not a rule of thumb.
For brands where the transition makes sense, we help engineer it: we work with the manufacturer on compliance training, we audit the FNSKU labeling process, we build the forwarder relationship, and we manage the quality control checkpoints on early direct-to-FBA shipments. The transition is not complicated — but it requires doing it deliberately rather than leaving a prep center relationship on autopilot because no one made the call to change it.
We have seen brands running prep center costs of $1.50 per unit on products moving at 3,000 units per month — $54,000 per year in fees that were largely unnecessary at that scale. That money does not disappear; it moves to your bottom line when you build the supply chain correctly.
Work With OBG
Supply chain optimization is one of the fastest ways to improve profitability on Amazon without changing a single keyword bid or listing element. We audit supply chains, identify prep center costs that should be eliminated, and build the direct-to-FBA infrastructure that scales with your brand.
Book a free strategy call. If we do not improve your profitability within 30 days, you get a full refund. That guarantee exists because we know what we find when we look at a brand's real operational cost structure.