Everyone has a different answer to this question, and most are based on personal experience in one specific location with one specific sourcing setup. That doesn't make them wrong. It makes them hard to generalize.
This isn't a list of magic categories. It's a way to think about what's worth your time — and then some honest notes on what's performing well right now.
The math most people skip
Before anything else:
Profit = sale price − (source cost + platform fees + shipping + your time)
The "your time" part is what new resellers tend to ignore. If you spend four hours sourcing, cleaning, photographing, and listing a pair of shoes to make €15, that's €3.75 an hour. You'd have done better almost anywhere else.
Good resale categories have three things in common: consistent demand, good margin relative to effort, and items you can source reliably. All three need to line up. One isn't enough.
Vintage and branded clothing
Still one of the most reliable categories, particularly for anything from the 80s and 90s. Demand for older branded pieces — Levi's, Carhartt, Ralph Lauren, Nike, Champion — has held up and continues to grow with younger buyers who grew up on thrift-flipping content.
What works here: pieces with clear brand identification, recognizable silhouettes, condition that photographs well. What doesn't: fast fashion from the 2010s, unlabeled basics, anything that looks generic.
The sourcing edge comes from knowing what to look for in secondhand stores before anyone else prices it correctly. That knowledge takes time to build. But once you have it, the margins are good.
Sneakers
High demand, established resale infrastructure, and a buyer pool that knows exactly what they want and will pay for it. eBay, StockX, and Vinted all have active sneaker markets.
The downside: it's competitive. The good pairs get picked up fast, and fakes are a real problem — both for you as a buyer and for your reputation as a seller. If you're getting into sneakers, learn authentication before you spend a cent.
Limited releases and collaborations still flip well. General stock of popular silhouettes (Air Force 1, Stan Smith, Samba) moves but at thin margins unless you source them significantly under retail.
Small electronics and accessories
Phones, tablets, gaming handhelds, wireless headphones. Demand is steady, items are easy to ship, and the resale market is mature enough that pricing data is easy to find.
The risk here is condition. Electronics that look fine can have hidden issues — battery health, screen burn, speaker damage. If you can't test an item properly before buying it, you're gambling. A lot of resellers in this category focus specifically on items where they can verify condition themselves.
Accessories (cables, cases, chargers for specific devices) are lower margin but faster-moving and lower-risk.
Toys, games, and collectibles
Potentially high margins, but research-heavy. A discontinued board game or a sealed LEGO set from a few years ago can be worth multiples of what you'd pay at a secondhand store — if you know what to look for. If you don't, you'll buy a lot of stuff that moves slowly at €5.
This category rewards deep niche knowledge. If you follow a specific franchise, gaming platform, or toy line closely, you'll spot value that generalist resellers walk past.
What to avoid (or approach carefully)
Furniture and large items: margins can be good, but logistics eat them. Unless you have a van and enjoy moving heavy things, the effort rarely pays off.
Luxury goods: real upside, but authentication is a genuine skill and the downside (selling a fake unknowingly) is serious — legally and reputationally.
Brand-new or near-new general merchandise: unless you're arbitraging retail discounts systematically, it's hard to compete with the volume sellers who do this full-time.
The actual edge
The resellers who do well over time aren't the ones who found one magic category. They're the ones who can move quickly on sourcing decisions, list efficiently, and keep the operation lean.
Sourcing speed and listing speed are the two levers. Most people focus entirely on sourcing and treat listing as a chore. But a backlog of unlisted items is just money sitting on a shelf.
FlipIQ was built around that second lever. Getting from "item photographed" to "listing published" faster, with titles and descriptions that are actually optimized — not just copy-pasted from memory. Less time per listing means more listings per week, which is where the math starts to work.