GameStation are currently offering "Guilty Gear Core" for only £4.98 (or £4.73 with 5% cash-back via Quidco)
"Guilty Gear Core" has an average rating of 75% from GameRanking, so not only is it cheap, it also appears to be half decent!?!
Just to confirm this is a new product, rather than second hand. The prices also includes P&P!!!