Mixamo.com has a good free Gangnam mo-cap you can apply to any uploaded model. It's actually a pretty interesting service, you can just upload a 3D model and their software will auto-rig it for you, and you can pick any animation to apply to the rig (This dance is one of them). Seems it'd be a great service for indie game devs -- not one myself, but looks fascinating.
Clickable: http://www.mixamo.com/editor/new/1643