On Amazon today you can get this Harry Potter: The Complete 8-Film Collection for only $31.99.
If you prefer the Blu-ray version, this Harry Potter: The Complete 8 Film Collection [Blu-ray] is only $49.99.
Both items ship FREE with Super Saver Shipping.
Note: Amazon prices and promotions can change at any time. The price(s) listed in this post is/are subject to change.