What Makes a Product Profitable?
A profitable FBA product has three core attributes: sufficient demand, healthy margins after all fees, and competition you can realistically enter. Demand means people are actively searching for and buying the product. Margins mean you can source it cheaply enough to cover Amazon's fees and still make money. And manageable competition means you are not going head-to-head with Amazon itself or dozens of established sellers in a price war.
Starting with Demand
The simplest way to gauge demand is through Best Sellers Rank (BSR). A product with a low BSR in its category is selling frequently. As a general guide for the UK marketplace, a BSR under 50,000 in a main category indicates reasonable sales velocity. Under 10,000 suggests strong demand. However, BSR varies hugely between categories — a BSR of 5,000 in Books means very different sales volume than 5,000 in Garden.
Tools like Keepa and Jungle Scout can estimate actual monthly sales from BSR data, giving you a clearer picture of how many units a product moves per month.
Calculating Margins
Before buying any product, you need to know your landed cost (purchase price plus any shipping to you or your prep centre), Amazon's referral fee, FBA fulfilment fee, and any prep costs. Use Amazon's FBA Revenue Calculator to plug in the ASIN and see the fee breakdown.
Aim for a minimum 30% ROI after all costs. If you buy a product for £5 and sell it for £15, but Amazon takes £5 in fees and prep costs £1, your profit is £4 — an 80% ROI on your £5 investment. That is a good product. If the numbers only leave you with £1 profit, one return wipes out several sales worth of margin.
Assessing Competition
Look at how many FBA sellers are on the listing. If there are 15 FBA sellers competing on the same product, your share of the Buy Box will be small and price competition will be fierce. Ideally, look for listings with fewer than five FBA sellers. Also check whether Amazon itself is selling the product — competing directly with Amazon on the same listing is extremely difficult.
Where to Look for Products
Retail arbitrage means scanning products in shops like B&M, Home Bargains, TK Maxx, and clearance sections of major retailers. Online arbitrage involves checking deals sites, retailer clearance pages, and using tools that flag price discrepancies between retail sites and Amazon.
Wholesale sourcing means approaching brand distributors and buying in bulk at trade prices. This takes more upfront work to set up accounts but provides more consistent, scalable supply.
Red Flags to Watch For
Avoid products in gated categories unless you already have approval. Steer clear of items with rapidly dropping BSR trends (demand is falling). Be cautious with seasonal products unless you understand the timing. And always check for intellectual property issues — some brands actively report unauthorised sellers.
Building Your Research Routine
Successful product research is not a one-off activity — it is a regular habit. Set aside dedicated time each week to scan for new products, check pricing on your existing catalogue, and explore new categories. The more products you evaluate, the better your instincts become for spotting winners.
At Precision, we see the products our clients are sending in and the variety is enormous. The sellers who do best are the ones who research thoroughly before committing their money. Take the time to do the maths — it pays off.