Coolshop are running their free game with any xbox 360 order offer again.
I picked SBK08 as it's a reasonable game and it's cheap.
£6.76 seems a pretty good price for 2 average/reasonable games.
Other cheap(ish) games available include
Burnout Paradise/Trival Pursuit double pack £14.47
Call Of Duty World at War £24.48
Don Kings Prizefighter £6.90
Infinite Undiscovery £11.49
Lost The Video Game £6.76