For how long, I don’t know, but LEGO Harry Potter Years 1-4 for iOS Universal (iPad, iPod touch, and iPhone) is only $0.99 US, down from a normal price of $4.99.
LEGO Harry Potter Years 1-4 lets you participate in events from the first four Harry Potter books – Quidditch games, the Chamber of Secrets, the Tri-Wizard tournament and others. You can visit Hogsmeade, Hogwarts, Diagon Alley, and a lot of other places, and you can do so as various Harry Potter characters (over 100).
I’ve got it, paid full-price for it, and it’s definitely worth the $0.99.
iPod touch and iPhone iOS Version at the Apple iTunes App Store:
LEGO Harry Potter: Years 1-4 – Warner Bros.
iPad iOS Version at the Apple iTunes App Store:
LEGO Harry Potter: Years 1-4 – Warner Bros.
It does require iOS 4.1 or later.