I picked up a 1972 (first year) Honda XL250 on Ebay the other day for $50. Granted it needs a lot of attention and parts, and probably a motor rebuild too, but I couldn't pass it up!
I am needing many parts, including a tank, clutch cover, exhaust, seat, etc. The frame is in pretty good shape and should look very nice after I sand blast it and give it a fresh coat of paint.
Fingers crossed on the condition of the engine.