Amazon currently has Buy 1 Get 1 Free on select Blu-ray and HD DVD titles!
Details:
Select any two titles from the list below and get one of them free. The promotional discount will be applied at checkout to the title of lesser cost. You will see a credit in your shopping cart. Limit two of each title per customer and 25 free titles per order. Quantities are limited--order now before they run out.
Check it out: