Where can I find a Game Boy Color Gameshark?

Amazon.com/Game-enhancer-Gameboy-Color-Pocket-Boy/dp/B00000K4CR/ref=sr_1_1?ie=UTF8&s=videogames&qid=1245569558&sr=8-1">http://www.Amazon.com/Game-enhancer-Gameboy-Color-Pocket-Boy/dp/B00000K4CR/ref=sr_1_1?ie=UTF8&s=videogames&qid=1245569558&sr=8-1

They aren't sold in stores, and I use this site on a regular bases, it can be trusted