Simply Games are selling "F.E.A.R." for the Xbox 360 for £9.00 (inc Del.)
You can get cashback through the usual sites (e.g. 4% Quidco, making it £8.64)
The next best price seems to be £14.99 from Play.
F.E.A.R is a paranormal action thriller presented entirely in first person. An unprecedented adrenaline rush of close quarters combat seamlessly melded with the spine-tingling, shocking intensity of the paranormal unknown.Already a critical and commercial smash on the PC, F.E.A.R. will bring a new level of FPS game play to Xbox 360 with brand new single player content designed to immerse the player deeper in the world of the F.E.A.R. team, as well as brand new multiplayer content created to fully utilize Xbox Live.Developed by Day 1 Studios in conjunction with Monolith Productions, F.E.A.R. is an intense first person close-quarters combat experience with rich atmosphere and an engaging, paranormal horror storyline.