I use this. It is not bluetooth but it works real well. It is a wireless optical mouse but the ball can be used as a trackball with the right click underneath like a trigger. The little silver button toggles between the ball and laser. I really like it. The ball does not perfect but it is okay to use from the couch. My set up is in my bedroom to mostly I just use my dresser to mouse around...
edit: it is also rechargeable and comes with the recharging station and batteries...