I saw this offer in my local Sainsburys (Southampton Lordshill) today this morning. Their XBOX 360 Console bundles were £154.99 for 4GB or £204.99 for 250gb slim consoles and a choice of one free game either The new Dead Space 2 or Fifa 11.. cracking deal for either.
I just had a look on their website but no sign of deal so am guessing its instore only !
Note: CEX are currently giving £30 cash for DEAD SPACE 2 (and about the same on ebay after fees).
So you would scoop a 4GB SLIM for £124.99
or a 250GB Slim for £174.99 after trading game