The Dark Knight Blu Ray sells 600K first day, breaks sales records.

[Dallinor]

RPG said:
Slowly but surely blu-ray is gaining momentum. It will never rival DVD though, especially when it costs £20 more for one movie. :/

You can get The Dark Knight for £14.99 on Blu-ray in HMV.

So unless the they actually pay you £5.01 to take the dvd version off their hands...