The saying 'good things aren't cheap, and cheap things aren't good' isn't quite right.
Good, cheap things come up all the time. Someone is just better than you at finding them.
This is a list of things I can't buy because of time, space or money. But you should go get it if you're in the area. Half the fun is in the chase, so if you don't want any spoilers, look away. Otherwise, check back for things near you. Chances are that these will be gone by the time you follow the links below, but good luck.