
A popular product can still lose money after shipping, fees, refunds and ads. So a "winning" product is one that passes five checks, in order, from free desk research to a small paid test. Write your pass rules down before you start, so excitement doesn't set them after the results.
| Check | Pass signal | Start with |
|---|---|---|
| 1. Demand | Steady or rising interest, not one spike | Google Trends, marketplace search |
| 2. Margin | Money left per order after all costs | A spreadsheet and fee pages |
| 3. Supplier | Two samples arrive on time and as pictured | Sample orders, e.g. CJ Dropshipping |
| 4. Platform rules | The channel allows how you'll sell it | Amazon, eBay, Walmart policy pages |
| 5. Small test | Your pre-set numbers are met | Platform reports, ad manager |
Google Trends shows relative search interest, not search counts. Over 5 years it shows weekly points; shorter ranges give finer detail (how Google Trends data works).
Paid tools like Helium 10 or Jungle Scout estimate volume and competitor sales. Use them only after the free checks pass.
Example, a made-up clip-on reading light:
| Price | $29.99 |
| Product from the supplier | −$9.00 |
| Shipping to the buyer | −$6.00 |
| Marketplace and payment fees (about 14%, check your channel) | −$4.20 |
| Ads per order (your estimate, then real data) | −$5.00 |
| Reserve for refunds and returns | −$1.20 |
| Left per order | $4.59 |
"$29.99 − $9 = $21 profit" is the most common mistake. After shipping, fees, ads and refunds, about $4.59 is left. If the result isn't clearly positive, drop the product or test a higher price. More on this: landed cost, revenue and profit.
A catalog page says nothing about delivery speed or what's in the box.
In the US you need a reasonable basis for any shipping time you advertise. If you state none, the FTC generally expects shipment within 30 days, with delay notices and refund rights (internet order delivery rules).
| Platform | Rule | Source |
|---|---|---|
| Amazon | You must be the seller of record; no other seller's invoice or packing slip in the box | Amazon dropshipping guidance |
| eBay | Ship from a wholesale supplier; you're responsible for delivery on time | eBay's drop-shipping best practice page |
| Walmart | Check the current rule in Seller Help before listing | Walmart Seller Help |
Rules change: check on the day you list. If the product breaks a channel's rule, don't list it there, whatever the demand. Another short list before ordering: four checks before you order.
Title, before: "Light Lamp USB LED Book Reading" After: "Clip-On Reading Light, USB Rechargeable, Adjustable Brightness for Bed and Books"
Make size, charging and compatibility easy to find: Baymard's research focuses on how buyers compare products and specs (ecommerce UX research methodology).
Reading the results:
Scale when all checks pass and you keep money after refunds and ads. Hold when one thing is fixable. Drop when the supplier is late, a rule blocks you, or nothing is left after costs.
SellerClaw connects to CJ Dropshipping, your stores and your ad accounts. It can run the whole loop:
Changes wait for your approval. Samples, supplier talks and your pass rules stay with you.
Example request: "Find 5 trending kitchen products on CJ Dropshipping and show what I'd keep from each at $24.99 on eBay after fees, shipping and $5 of ads per order."
Want to test products without guessing the numbers? Start free with SellerClaw.