This may be ymmv, but My local Kmart has DJ hero 2 for $11.54 and the party bundle (2 turntables a mic and game) for $32.99. They have it for wii and ps3.
I've had the first one sitting sealed in my closet since it was $10 last year at Toys R Us...I haven't even once been vaguely interested in playing it, lol.