Amazon has Harry Potter and the Deathly Hallows, Part 2 (3-disc Blu-ray Combo) for only $14.99 (reg. $35.99). Shipping is Free with Amazon Prime or a $25 Amazon order. The 2-disc Blu-ray bundle is $5 more – so this is a great deal.
Also, Harry Potter: The Complete 8-film collection is $48.99 (reg. $98.92). That's only about $6 per DVD.