QUICK ANSWER
Run both. Keepa Product Finder filters the entire UK Amazon catalogue to surface candidate ASINs; SellerAmp SAS validates each candidate at the supplier-page step. They aren't substitutes — they're sequential. Total cost ~£30/month and this is the standard UK OA tool stack. If you can only afford one: Keepa first (€19/month, includes Product Finder + chart data), then add SAS at month two.
The two stages of OA sourcing
Online Arbitrage breaks into two stages every UK OA operator runs:
- Sourcing. Find ASINs that look promising — sufficient sales velocity, stable buy-box, not gated to me, not IP-risky.
- Validation. For a specific deal (this ASIN, this supplier, this price, today), confirm the unit economics work — ROI after fees, after VAT, after expected return rate, with sufficient cashback breakeven margin.
Keepa Product Finder serves stage 1. SellerAmp SAS serves stage 2.
What Keepa Product Finder does
Filter the UK Amazon catalogue by criteria like:
- Sales rank (BSR) under X.
- Monthly sold over Y.
- Buy-box stability above Z%.
- FBA-only listings, exclude AMZ-as-seller.
- Price range £15-£60.
- Exclude specific categories (electronics, beauty, restricted).
- Brand whitelist or exclude common-IP-claim brands.
Output: a list of 30-200 candidate ASINs. None of them are validated yet; you don't even have a supplier link. This is sourcing.
What SellerAmp SAS does
You're now on a supplier page (Tesco, Argos, B&M, a brand's own site). The product matches one of your Keepa-found ASINs. SAS opens an overlay showing:
- ROI at this exact supplier price.
- FBA fees, referral fees, storage estimate.
- Eligibility status for your account specifically.
- IP-claim history flag.
- Hazmat / melt risk / oversize warnings.
- Sales velocity, monthly sold (pulled from Keepa).
Output: yes/no decision on this specific buy. This is validation.
Why running both is the standard
Sourcing and validation are different problems requiring different data.
- Keepa Product Finder doesn't know what supplier price you can get. It cannot calculate ROI for a specific deal.
- SAS doesn't help you find ASINs you don't already have a candidate for. It cannot reverse-search the catalogue.
- Combined: Keepa surfaces 50 candidate ASINs, you find suppliers for the 10 most promising, SAS validates each on the supplier page.
The stack is ~£16/month (Keepa Premium) + ~£15/month (SAS) = ~£31/month total. This is the standard UK OA toolkit and it pays back in the first 1-2 buys of any month.
If you can only afford one
Keepa first. Reasons:
- Without sourcing, validation has nothing to validate. You can't run SAS in isolation — you need a candidate flow.
- Keepa data underpins SAS anyway. Even if you weren't using Product Finder, SAS pulls Keepa data under the hood.
- The free Keepa extension shows charts; for the first month while you're learning to read them, that's enough alongside community Discord deals.
- Once you're confident, upgrade to Keepa Premium and add SAS in month two.
The verdict
Run both. They're not substitutes. Keepa Premium for sourcing + SellerAmp SAS for validation = the standard UK FBA OA tool stack at ~£31/month total. If budget-locked to one, start with Keepa, add SAS within 60 days.
FAQ
Are Keepa Product Finder and SellerAmp SAS the same thing?
No. Keepa Product Finder is a catalogue search tool (find candidate ASINs across all of UK Amazon). SellerAmp SAS is a per-deal validator (evaluate one supplier-to-Amazon match for ROI and risk). They're stacked, not substitutes.
Can I do UK OA with just Keepa Product Finder?
Partially — you'd source candidates with Keepa and validate manually using its chart data. This works for ~30 deals/week solo but is slow. Adding SAS at £15/month roughly triples per-hour validation throughput.
Can I do UK OA with just SellerAmp SAS?
Only if your sourcing comes from somewhere else — paid lead services like Source2Store, free UK OA Discord channels, or supplier price lists you already have. SAS validates; it doesn't source.
Should I get SellerAmp or Keepa first as a beginner?
Keepa first. The chart-reading skill is foundational, and Keepa Product Finder gives you sourcing capability. Add SellerAmp in month 2 once you're validating 10+ deals/week and the manual ROI math is eating time.
How much is the standard UK OA tool stack?
Keepa Premium (~£16/mo or €149/yr) + SellerAmp SAS (~£15/mo or ~£135/yr) = ~£31/month or ~£284/year. Add SellerBoard for profit tracking (~£15/mo) and you're at ~£46/mo. That's the lean UK FBA OA stack.
Does SellerAmp work without Keepa?
Technically yes — SAS has fallback data sources. In practice, SAS is materially less accurate without an active Keepa Premium subscription underneath because BSR history and monthly-sold figures lose depth. Run both.
Educational content from a live UK Amazon FBA operator. Not financial, legal, or tax advice — talk to a qualified UK accountant for your specifics. Tool features and prices change; check the vendor's site before subscribing.
Related from the Method FBA blog: Keepa for UK FBA — chart-reading tutorial · A2A arbitrage UK · £5K Amazon FBA UK playbook · All recommended tools.