Download '300' in HD from the XBOX Live Video Marketplace between 28th Dec & 29th Dec for just 100 Microsoft Points.
taken from xbox.com:
"For 24 hours starting midnight 28 December, anyone with a broadband connection and Xbox LIVE membership (Silver or Gold) can take advantage of this terrific limited offer. 300, critically acclaimed as the Citizen Kane of cinematic graphic novels, can be yours to rent in HD for the bargain price of 100 MS Points. Why? Because the Xbox LIVE Marketplace Video Store is now open for business, and you really must experience it for yourself to know fantastic it is."