Are you talking about the return of defective goods? Over here stores have to take things back if they're defective even if you don't have a receipt. If you just want to return it because you don't like it it's up to the store to decide whether to take it back or not, and they usually ask for a receipt in that case.

And back on topic, $40 is a very good deal. Gamestation sell PSOnes with a screen for £40