I'm looking for a 26'' mountain bike for a lock-up in bad areas. The cheaper the better, and I don't mind a fixer-upper if the frame and wheels are intact and serviceable. I would prefer to deal locally to avoid the hassle and expense of shipping. Ideally this bike would be around $50, I truly am looking for a walmart special or a mechanically flawed higher-end bike. Size is not an issue unless ridiculously long/short in TT.

Thanks!