Last week I posted Amazon's £17.99 deal on the PS3 version, this week dvd.co.uk have kindly obliged for the Xbox 360 owners. Result!
Thanks to AugQX for pointing out cashback with topcashback and 101cd.com/BlahDVD.com. Now showing £17.80 at BlahDVD.com :)
[NB Blah, DVD.co.uk, 101cd and base.com all operated by same company]