OK, was looking at getting this, and not seen it around anywhere for much less than the £150 it released at. Just been in to my local tesco and found it for £125 there. Is available on XBOX 360/PS3 and also for the Wii, but it isn't as cheap as the HMV deal for the Wii version.
Next cheapest I found was in Asda for £127. But I preferred to go to Tescos to get the clubcard points.