If the WII or XBOX Kinect isn’t for you, then you might want to check out the PlayStation Move.
You’ll obviously need a PlayStation 3, but it also requires a PlayStation Camera (sold separately or in a PS Move Bundle). Single Move Controllers are on sale at Superstore for only $29.99. These usually go for $50 so its pretty big savings.
The Move Navigation Controller is also on sale for $29.99. I own a set, and playing Killzone 3 with it is pretty awesome!