My local Target salesclerk didn't even blink, just keyed in a $39.99 price override on "Knack" and then immediately generated a new price sticker for the shelf.
My first post (I didn't see this posted yet--sorry if duplicate):
http://www.amazon.com/Guitar-Hero-World-Tour-Xbox-360/dp/B001ABP95E/ref=sr_1_2?ie=UTF8&s=videogames&qid=1262027955&sr=1-2