Use a discount link for the price above. Seems to be sold out in many, many other stores. The only ones offering a new DVD-set online were: £14.79 (DVD Source), £15.99 (MovieMail), £24.99 (Amazon.co.uk Marketplace).
A good deal if you're still able to get it at this price.
Citizen Kane: Special Edition (2 Disc Set) | DVD Special Features:
-Anatomy of a Classic presented by Barry Norman
-Heart of Ages
-1938 War of the Worlds radio broadcast
-The Happy Prince
-12 cast and crew profiles
-The original production budget