Just got back from Rawtenstall ASDA and I have seen a sign stating the deal. I presume it will be nationwide as it was on a small board.
Assassins Creed 2 for PS3 (and probably XBOX360) for £34.71
Released on 20/11/2009
Cheapest I have seen it online is for around £37.
You're only saving a couple of pound but it's better than nothing.