Retail arbitrage is one of the most accessible ways to start reselling in the UK. The concept is simple: you buy products at retail price (from shops, supermarkets, discount stores, or clearance sections), then sell them online at a higher price. No manufacturing, no bulk importing, no complex supplier relationships — just you, a car boot, and an eye for a margin.
It sounds straightforward, and in some ways it is. But there's a gap between people who dabble with it and people who actually make consistent money, and that gap is mostly knowledge and process. This guide covers both.
The basic model: you find a product selling in a physical store for, say, £10. You check what it sells for on eBay, Amazon, or another online marketplace and find it's going for £22. After fees and postage, you're making £7–9 per unit. You buy as many as you can reasonably move, list them online, and repeat.
The margin opportunity exists because of price inefficiencies. Physical retailers price for their local market and don't dynamically reprice based on online demand. When a product is discontinued, clearanced, or simply cheaper at a particular retailer than its online going rate, that's your window.
Tesco, Sainsbury's, Asda, Morrisons, and Waitrose all run clearance sections and markdowns on slow-moving stock. Seasonal clearance (post-Christmas, post-Easter, end of summer) is where the biggest margins appear. Toys, health and beauty, homeware, and seasonal goods all have solid RA potential in supermarket clearance.
B&M, Home Bargains, Poundland, and similar stores are RA staples. They stock branded goods at below-RRP prices, often from manufacturer overruns or discontinued lines. The challenge is that other resellers shop here too, so popular finds get saturated quickly. You need to be there early and check a wide range of departments, not just the obvious ones.
Argos, Wilko (where still open), and department store clearance sections are good for toys, electronics accessories, and branded goods. Argos clearance in particular regularly surfaces items priced below their eBay going rate.
TK Maxx is a goldmine for RA if you know what to look for. They stock branded goods at significant discounts — the product range changes constantly and varies by store. Health and beauty, branded accessories, and homeware from recognised brands often have solid online margin. The inconsistency is the challenge — you can't rely on the same finds every week.
Sports Direct, Decathlon, and similar retailers run clearance on branded sports equipment and clothing. Branded trainers, specific kit items, and fitness accessories can have strong RA margins when you find the right clearance items.
The fundamental skill in RA is quickly assessing whether a product is worth buying. You need to check the secondary market price and calculate margin before you put it in your basket.
If you're selling on Amazon, the Amazon Seller app lets you scan barcodes and immediately see the current Amazon price, sales rank, and your estimated profit after fees. This is the quickest in-store check for Amazon-bound stock.
For eBay, search the item on the mobile app and filter by "Sold items" to see recent sale prices. Divide the average sold price by the store price and you'll quickly see if there's margin. Factor in eBay's ~13% fee and postage costs before deciding.
Clearance markdowns often happen on Monday or Tuesday. Other RA sellers hit the same stores, so going early — Tuesday morning rather than Saturday afternoon — gives you first pick before stock gets picked over.
Make a regular circuit of your best-performing stores. You'll learn the markdown patterns, when new clearance stock appears, and which departments are worth checking. Ad hoc sourcing is less efficient than systematic store runs.
Just because something looks like a bargain doesn't mean the margin is there. Run the numbers every time. Markets move — something that sold for £30 last month might be £15 now because Amazon restocked or a competitor dropped prices.
On eBay, looking at how many identical items sold recently tells you whether there's genuine demand or just a handful of optimistic sellers. On Amazon, the sales rank gives you a rough demand signal — lower rank means faster sales.
On Amazon specifically, some brands and categories require ungating (approval to sell). Check before you buy. On eBay this is less of an issue, but counterfeit concerns mean branded goods need to be genuinely authentic.
RA is a great starting point because it requires no upfront supplier relationships and low minimum investment — you can start with £50–100 and test what works. The limitations are time (you're physically visiting stores) and scalability (you're limited by what's on shelves locally).
As you grow, you'll likely add wholesale sourcing, online arbitrage, or niche product specialisation. Our full UK reselling guide covers how these different sourcing methods fit together as a business.
Retail arbitrage income is taxable above the £1,000 trading allowance. Keep receipts for everything you buy — they're your cost of goods evidence if HMRC ever asks questions. A simple spreadsheet tracking purchase cost, sale price, fees, and postage per item is all you need to start. Our UK reselling tax guide explains what you need to declare and when.
The resellers making the most from RA aren't just walking into B&M and hoping for the best. They know what's selling online before they source, they have price alerts set up, and they're part of communities where good finds get shared.
ResellRadar gives members exactly that — product drop alerts, restock signals, and a community of UK resellers who share sourcing intelligence daily. It's particularly strong for TCG and collectibles, where the timing of when you source matters as much as what you source.