I always hear about these nice vintage mtb's for $100-200, and I have sold quite a few bikes over the years, but never see anything on CL that is under $250 that's any good. And if it's a good deal it's gone so fast you wouldn't have a chance.
That mid 90's steel Giant I found recently was the first non road bike in steel I saw worth a damn in years. Of course it was only $20........
I have only ever saw junk Ross in my travels. Oh well.