Home / Compare / Amazon Arbitrage & FBA Tools
Short answer:
| InventoryLab | WAMP | |
|---|---|---|
| Pricing | Included in Threecolts Seller 365 from $69/mo (no standalone plan) | Free (beta); WAMP Pro coming soon |
| Free option | Free trial | Yes (free for life beta) |
| Works with | Amazon | Walmart Marketplace |
| Best for | FBA sellers who need listing, prep and accounting in one | Walmart retail, online and wholesale arbitrage sellers |
| Strengths | + Accurate FBA profit tracking + Streamlined shipment workflow + Includes Scoutify | + Free during beta + Built by the SellerAmp team + Walmart-specific fees and rules |
| Weaknesses | - Amazon-only - Monthly cost | - Walmart only - Pro features not released yet |
| Visit InventoryLab | Visit WAMP |
InventoryLab handles FBA shipment creation, cost tracking and profit reporting, and includes the Scoutify 2 scanning app. It is now sold only as part of the Threecolts Seller 365 bundle. It is popular with retail arbitrage and wholesale sellers who want accurate profit numbers.
WAMP is SellerAmp's sourcing analyser for Walmart Marketplace. A Chrome extension shows profit calculations, historic price and sales charts, Buy Box analysis and restriction badges for Walmart products, so you can check a Walmart flip the way SellerAmp checks an Amazon one.
Retail and online arbitrage on Amazon live and die by data: sales rank, price history, Buy Box competition, fees and ungating restrictions. These tools range from free browser extensions to full research suites. Beginners usually start with one scanner app plus Keepa, and add a sourcing suite once they are consistently profitable. The deciding factors usually come down to each tool's standout strength (for InventoryLab: accurate fba profit tracking; for WAMP: free during beta) weighed against its main drawback (amazon-only versus walmart only).
Still undecided? See InventoryLab alternatives or WAMP alternatives.
Flip Profit Calculator ($12)
Spreadsheet that returns net proceeds, max buy price, ROI and a GO / COUNTER / PASS decision with fees for 10 platforms, plus a 500-row flip log and dashboard.
Marketplace Pricing Cheat Sheet ($7)
Fees for 8 resale platforms, max-buy and ROI formulas, comp check, net payout table and shipping reference on 6 printable pages.
Instant digital downloads sold via Gumroad.
Checked 2026-10-17. Confirm current pricing on each site.