In the winter, I often spend Sunday morning at the indoor flea market near my home. Since I look for things other people aren't interested in, some of my favorite finds have come from there. I am pals with a couple of the regular vendors now and can often get extra special deals!
Summertime brings more options, not to mention yard sales! At least three flea markets compete for my attention. One of them tends to draw several vendors who buy out abandoned storage lockers and estates, and they often unload the stuff they don't consider valuable enough for their shops at a dollar or less per item, no matter what it is. Imagine a hundred boxes full to the brim with all the clutter from a dozen people's attics, basements, and closets, and you get the picture! Most of it is truly junk, or things of no interest. But SOME of it has great craft potential, simple immediate use, or whimsy. Among the uncountable things I bought last year are: an emu egg; a Japanese netsuke bead; Javanese shadow puppets; a Japanese lacquer bowl; a brand new cream silk scarf with gold brocaded design from India; a carved wooden Indonesian dragon; wicker bird cages; mirrors; bowls; art and craft supplies and tools; and much much more!
Sometimes I buy things I don't even want if they are in great condition and seem to have resale possibilities. I have made more than $200 profit in the last year taking my quarter and dollar buys to a consignment shop where they put antique store prices on things! This is without making a serious effort -- someone with more interest and knowledge than me, and more cash to lay out in the first place, could probably REALLY do well!