Get yourself on your local Freecycle group (as long as you don't live in my area!) the only bikes that ever crop up on there are old MTBs with horizontal dropouts.
I'm currently turning a pretty crappy old Coventry Eagle I got off there into a cycle speedway bike, mainly because it's something I've never done before. No it's not a proper Coventry Eagle, just some badge engineering.
that freecycle is a strange place , i saw someone offer a fiesta with a few months mot a few months back , never notice any bike stuff and even if i did i wouldnt know how to get my hands on it as its been ages since ive signed up