if you want something inexpensive, try a vivitar from walmart. for about $50, you get the camera, waterproof lens, and a bunch of mounts. All you need is the sd card.
obviously, not the best out there...but for $50, I don't care if it gets ruined.
2012 Brute Force 750 EPS (stock)
2012 Grizzly 550 EPS Camo and gun racks (wife's ride)