If you bid in a computer auction but don’t win, the seller might email you to ask whether you would like to buy a computer the same as the one they just sold through their own website.

This is a bad idea! You have no guarantee that the item will ever arrive, and you haven’t just given them your money – you’ve given them your credit card details too.

There are sellers with nothing but positive feedback who use this scam often – and since you won’t be able to leave them any feedback on the transaction, their reputation will stay that way. If you complain to eBay that you bought an item outside the site and got scammed, they will tell you to get lost and not do it again.