Play.com deal of the week for Xbox 360 is the darkness at £17.99
However go to PC World - Pick one up of the shelf at £39.99 take it to the till and ask for the price match with play.com.
Remember to remind them that they beat the price by 10% of the differencehttp://www.pcworld.co.uk/martprd/editorial/price-match-promise
You should get it for £15.79
Hope this helps someone