For those interested, the Immersion set is on sale for $62.99, which is a lot better than the normal pricing of about $100. From Gizmodo (Giz said normal price was $150, but I think it is usually $99 that I remember).
Amazon.com: The Dark Side Of The Moon - Immersion Box Set: Pink Floyd: Music
Includes both the 5.1 mix AND the Quad mix (sounds like Dolby, 448K and 640K), a Blu-ray version with the 5.1 mix in 96/24 and a TON of previously unreleased tracks and video.
