I picked up some Jazz brand cameras in Wal-Mart to use in my nursery school class. I can't remember exactly how much they were, but they came in multi-packs and were quite a bit cheaper than the name brand cameras. I've used 6-8 so far, and I haven't had trouble with one yet. My co-teacher and I compared my shots from the Jazz cameras with her shots from a Kodak disposable camera, and there was no difference.
Beth