Derby Park Flea Market is a good place to find that certain something that you didn't know you needed. There are tons of vendors, so you get a good variety of items and if you collect anything, you can spend hours here.
However, a huge drawback (for me, at least) is there are way too many people selling junky stuff from wholesale catalogs. After a few weekend visits you realize that these people make up the bulk of the sellers. But the good news is, the rest of the sellers are true flea marketers. They've got quirky little items that will spark your interest. If it wasn't for these few people, I wouldn't bother with Derby Park.