thanx to all. I picked up a Roadmaster Marble point 21 speed mtn bike with a chromoly frame and shimano equipped for $20. It looks barely ridden and obviously not in a while. the chain slips a little and it doesn't shift well, but I figured I will take it to a bike shop to get tuned up. i've already had fun riding it around despite the problems. I really appreciate all the advice. If this was a bad purchase, you can feel free to admonish me for it. I will chalk it up to a learning experience.