A heads up for those thinking of a last minute Hardened Edition buy. Amazon, Tesco, Game, Asda and Gamestop have all sold out on both Xbox and PS3. The only places I've found it for PS3 are Shopto and Zavvi (where I ordered mine from). Xbox I can't find anywhere. Places that still have it have also hiked the prices to £85 which to me means there's no more after these last few.
£85 still seems a good deal though as the regular game is £40, Elite membership is about £30 for a year and I'm expecting 3/4 map-packs which will add another £40 on the price (taking everything over £100. If you're a multiplayer person and you like the additional features a last minute Hardened search could be worth it.