Vintage mountain bikes are cheap and fun.
The first real vintage mountain bike I found was this 1995 Diamnondback Vertex WCF. I found it at a pawn shop in the fall when all the bikes were on sale. The guy helping me was trying to convince me to buy some nice Cannondale, but I couldn't pass up this bike with carbon fiber in the frame and almost half the price of the Cannondale. This is one bike I have never seriously considered selling. I am looking forward to riding it alot more this summer.