PC World is selling "The Darkness" for the Xbox 360 for £14.97 (inc Del.)
With the attached 5% off voucher, this makes it £14.22.
You can get cashback from the usual sites (e.g. 2.5% Quidco, making it just £13.93)
The next best price seems to be £17.93 from TheHUT.
The Darkness is spreading.
A cold-blooded mafia hitman becomes even more deadly when a terrifying inheritance is forced upon him on the eve of his 21st birthday. Possessed by The Darkness, Jackie Estacado discovers he wields a terrible power which can destroy his enemies without mercy, but this exhilarating force comes at a price - The Darkness has a malevolent agenda all of its own...
Blast your way through the dark and seedy underbelly of New York City.
Experience intense cinematic action in this gritty, first-person shooter with a horror twist
Use the awesome and terrible powers of The Darkness to devour, impale or implode your foes.
Extra Content: Play as Darklings in Multiplayer Online Modes.