1. Evaluate the ASIN Before the Supplier Quote
Start with the marketplace, not the discount sheet. Review the current selling-price range, Buy Box behavior, number and quality of competing sellers, whether Amazon itself is active, sales consistency, category restrictions and any signs that the listing is unstable.
2. Build the Unit Economics
Use current expected selling price and current Amazon fees, then subtract supplier cost, prep, inbound freight and other relevant costs. Do not evaluate the purchase only on gross margin before Amazon fees.
Run at least a base case and a downside price case. If a small Buy Box decline removes the entire profit, the purchase has very little margin for error.
3. Check Supplier and Invoice Quality
Wholesale documentation matters operationally. Confirm that the supplier is legitimate, invoices clearly identify the buyer and seller, product descriptions/SKUs can be tied to the inventory, quantities are clear, and records can be retained. If Amazon requests documentation later, weak purchasing records can become an account problem rather than only an accounting problem.
4. Decide the Purchase Quantity From Demand and Lead Time
Do not buy simply because the supplier offers a better case price. Estimate expected unit velocity, existing inventory, inbound units, supplier lead time, prep and transportation time, Amazon receiving time and a reasonable safety buffer.
A large order can improve unit cost while making the business less profitable if it creates excess inventory, storage exposure or price pressure.
5. Understand Competition Risk
Look beyond the current seller count. Ask whether sellers are entering or leaving, whether the brand controls distribution, whether the listing has frequent price wars, whether Amazon participates and whether the expected margin survives normal competition.
6. Check Reorder Potential
A one-time profitable buy can be useful, but a repeatable supplier-product relationship is more valuable operationally. If the first order sells well, can the supplier replenish? Is the lead time predictable? Are order minimums manageable? Is the product likely to remain available?
7. Review the Purchase Order as a Portfolio Decision
The right question is not only “Is this ASIN profitable?” It is also “Is this the best use of the next dollar of inventory capital?” Compare expected ROI, cash tied up, days to sell through, supplier concentration and downside risk across the products you could purchase.
Pre-PO Decision Checklist
- Selling-price stability and realistic downside price.
- Current Amazon fees and complete unit cost.
- Expected margin and ROI.
- Competition and Amazon presence.
- Restrictions and listing stability.
- Supplier legitimacy and invoice quality.
- Current stock, inbound units and expected velocity.
- Supplier, prep, freight and receiving lead times.
- Reorder potential and minimum-order constraints.
- Cash exposure if the product sells slower than expected.
Use the Before You Buy Inventory: Amazon Profitability Checklist for a repeatable review before each purchase.