Curlis
CAGiversary!
This is the cheapest I have seen this, unfortunately this is only for the 360 version.
http://www.amazon.com/LEGO-Harry-Po..._2?s=videogames&ie=UTF8&qid=1333724066&sr=1-2
http://www.amazon.com/LEGO-Harry-Po..._2?s=videogames&ie=UTF8&qid=1333724066&sr=1-2