Sealed Pokemon cards. I like bargain hunting too. Normally spend whole days going to secondhand stores, clearance stores/closing down sales, car boot sales, council pickups, etc. Mostly I look for tech, collectable toys and books but I'll buy whatever if I think it's a good deal. I started doing it as a kid to make much-needed money by reselling but since I don't need to these days I just keep stuff or sometimes re-donate it.