Not everyone's cup of tea but it's the cheapest price I can find online at the moment for the PS4 version. Includes Zombies in Space and Terminal bonus multiplayer map.
Top Cashback : 1.15% - 2.3%
Quidco website still down at time of posting.
(Cashback not guaranteed!)
Edit : Price reduced from £48.85 to £47.85, thanks steeeeevemadden for update