Seems a good price for COD Ghost, and you don't normally see any COD's for a fiver new.
You will need prime or to spend over £10 for free delivery.
Review here: http://www.metacritic.com/game/pc/call-of-duty-ghosts
For those PC people who are confused on what ones you have played here is a list of them in order:
CALL OF DUTY
3 NA on PC
4 Modern Warfare
World at War
Black Ops 2