You should just find a used one somewhere. They go for extremely cheap (15 bucks or less) and it's less of a hassle. Can't say how long it'll last though.
This one is about $10, though, and it comes with Sonic Adventure and Sonic Shuffle (and 3 other games I don't care for as much), so it's an okay deal. I know there wouldn't be any Dreamcasts around my town.