The Petra Zone

I had this game as a kid, and now I have kids of my own and would like to find it somewhere. It is no longer available and I've found a few offerings on EBAY, but they are going for $40 or more. Does anyone know of a web site that sells vintage or used games? I would really like to get it my whole family loves to play games, and I am trying to get my kids away from the TV.

Have you tried half.com? It's part of e-bay, but you don't have to bid (the prices are set) and a lot of the time, you can find stuff for less there than you can on e-bay. The only problem is that the site is a lot more limited than e-bay, but you never know!