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RevSeller is one of the tools we point people to on our Resources page, and it comes up often enough in questions about sourcing LEGO on Amazon that it’s worth a proper look on its own.
What it actually does
RevSeller is a Chrome extension that overlays profitability data directly onto Amazon product pages, so you’re not tabbing back and forth to a separate calculator while you’re sourcing. It shows an on-page profit and ROI calculator, the number of active FBA and MFN sellers on a listing, and lets you adjust price and cost inputs to see the bottom-line impact before you commit to buying anything. There’s also a set of quick links out to other research tools, which saves a few clicks during a sourcing session.
It only runs on Amazon.com and Amazon.ca, and only through Chrome on desktop, though separate mobile apps exist for iOS and Android if you’re sourcing on the go.
Where it actually helps with LEGO
The seller-count display is the feature that matters most for LEGO specifically. Knowing how many FBA and merchant-fulfilled sellers are already competing on a listing tells you a lot about whether a set is worth buying to resell before you even run the profit math: a set with 20 sellers already listed is a much harder sell-through than one with 2 or 3. Pair that with the on-page profit calculator and you can rule out a bad flip in a few seconds instead of running numbers manually on every set you’re considering.
Pricing
RevSeller runs $99.99 a year (works out to $8.33 a month billed annually), or $19.99 a month if you’d rather not commit upfront. There’s a 30-day free trial with no credit card required, which is enough time to actually test it against a few real sourcing trips before you decide.
The verdict
For someone doing occasional LEGO flips, the free trial is probably enough to get a feel for whether the workflow speeds things up. For anyone sourcing regularly enough that they’re checking seller counts and margins multiple times a week, the annual price is easy to justify against the time it saves and the bad buys it helps you avoid. It’s not LEGO-specific, but the core things it surfaces (competition and margin, in one glance) are exactly what matters most when you’re deciding whether a set is worth the buy.