I was in Sainsburys today and noticed this awesome deal. Its the 3 disc set in a really slim cardboard sleave, not the the big collectors edition box.
They Also have other great deals on multi disc sets like :
Willow, Princess Bride, Legend - £ 8.99
American Pie Trilogy - £ 9.99
Die Hard Trilogy - £ 9.99
Plus others that we can't remember!