Next cheapest is £13.93 @ TheHut. Also 5% cashback via quidco.
Harry Potter & The Philosopher's Stone:
Hogwarts Term Begins... Be Harry Potter in Harry Potter and the Philosophers Stone. With friends Hermione and Ron at your side, cast spells and confront adversaries to thwart You-Know-Who's evil plans.
Harry Potter & The Chamber Of Secrets:
Dare You Return To Hogwarts? Unlock the mystery at the heart of the Chamber of Secrets. Featuring Wizard Duels, a duelling club, Quidditch and all your favourite characters.
Harry Potter And The Prisoner Of Azkaban:
The Dementors Are Coming ... ...and this time Harry needs his friends. Play as Harry, Ron and Hermione. Face the Dementors, Fly Buckbeak