Walmart.com Harry Potter Years 1-4 (PSP) $8.96

seems like a good price, but really really poor reviews for this version on amazon:

http://www.amazon.com/LEGO-Harry-Po..._5?s=videogames&ie=UTF8&qid=1319989084&sr=1-5

Yeah decent price but i honestly wouldn't buy it for more than five bucks sowwy

Faired relatively well on Metacritic. http://www.metacritic.com/game/psp/lego-harry-potter-years-1-4 IGN said it best:
LEGO Harry Potter is a decent game. It'll prove to be a great deal of fun for those who are either into LEGO games or those who are into the Harry Potter series (or better yet, both), but it does nothing unique, fresh or interesting that sets it apart from the pack.