What's a good estimate of the value of this game? I've had a copy sitting around since the summer of 2006, when I bought it for $1 at a flea market, I just had a hunch that it was rare. Recently, I saw a copy sell for about $125 on ebay. AtariAge lists it as a R9, while our guide lists it as a R8. I was wondering, do you guys think I should hold on to it while it accumulates in value, or should I sell it now? I don't really collect Atari stuff and I don't even have a (working) Atari to test it. It's in decent shape, and I can also post a picture.