I found what I was looking for on Craigslist a few weeks ago. It is a 2008 GT Avalanche 2.0 in decent shape and I got it for $200. The ad was in a town about 100 miles from me, and I drove to pick the bike up. The deal went fine, and I thought all was well. Last week I was reading a message board and someone mentioned recording the serial number of your bike. Good idea, I thought. I turned my bike over, and it looked as if the SN has been filed off! (the underside of the BB) I felt sick. I never thought of checking the SN when buying a used bike. I have emailed the guy who sold it to me to question it (with no reply) and have also posted an ad in the area that I bought it looking for the owner.
I hope that the owner sees the ad.
If you buy a used bike, don't be a ****** like me .... question the seller and check for that serial number.