I was checking out a local game store a couple weeks ago when a Sonic 3 clamshell case for sale caught my eye (with the game, I assume). I don't know if it has the manual. I know these are pretty rare, but I held off on buying it. I already have a Sonic 3 cartridge, so I figured if they are worth something, I could sell it on eBay and make a few bucks. What do you guys think it is worth?