RRP of £34.99, the next cheapest is about £24. However, Game, Gamestation & Amazon all have it on special for £15.99 right now. Game has a relatively generous rewards program, so I personally went with them. This is now pretty much the cheapest it's been.
Complete Collection contains:
High quality Art Cards featuring artwork from Final Fantasy IV and The After Years
Screen-cleaning cloth decorated with Cecil from Final Fantasy IV character design
Special fold-out presentation box
Special downloadable content for use in Dissidia 012 [duodecim] Final Fantasy
Offering the ultimate compilation of the FF IV saga, Final Fantasy IV Complete Collection offers Final Fantasy IV and its sequel The After Years into one package. A cast of unforgettable characters fight through one of the grandest stories ever told with stunning new graphics, a re-arranged, award-winning soundtrack, and bonus game features that provide the absolute FINAL FANTASY IV experience.
Quidco/TCB on top.