I love me some kung-fu exploitation movies, and I've always found the goodwill's VHS section to be the best place to pick them up. I think most of the worthwhile ones are being released on DVD now, though. I bought this hilariously massacred dub of Fist of Fury when I was a kid, it's the best movie ever.
Also, has anyone ever noticed that every thrift store is always guaranteed to have like 5 VHS copies of Men in Black, Jerry Maguire, The Phantom Menace, and Star Trek Generations?
That's always bugged the crap out of me. I guess they're universally reviled.