Don't foget to check the quality of the blu-ray transfer before you buy anything, some movies have horrific bad quality rushed transfer and some had pretty bad sources to begin with and go theough no mastering. Don't just assume a blu-ray will be great quality just because its in HD.
I find these 3 sites the best for quality reviews and specs -
http://bluray.highdefdigest.com/reviews.html
http://www.blubeaver.ca/
http://www.blu-ray.com/movies/reviews.php
The extra's on the disc will vary as these 3 sites are for the american versions but the actual movie transfer itself will be identical.
Oh yeah heat added for this deal as £7 is my price point to buy pretty much anything half decent if the quality reviews check out.