This is priced up at £46.00 but by using the following codes I have managed to get it for £13.30 delivered... The cheapest I have seen this game was on these forums at £20 from Argos.
20% off electricals (xx086) codes
£23.50 off £45 spend (ZQ055)
You could also try Quidco (4.5%) bringing the total to £12.70