In my experience, the cheapest thrift store on the Ave. I've been fortunate many times to find a good pair of pants for under $10, as well as shoes, belts, and shirts for similar prices. They have a great rack of dresses that would be excellent for costumes. They have a large buying counter, but they're very specific about what kinds of clothes they're buying at any given time, and very picky. But it's worth a try, especially for store credit.
more