As it says in the title really, went into my local ASDA after work and saw that they had this for only £20 seems like a good price to me, particularly when you can just go into the store and pick one up. Not sure if it is nationwide but it was on a proper price tag so hopefully it is.
Please note that this appears to only be in store
Having problems getting on to the ASDA web site at the moment, so no direct link but since it ISN'T AVAILABLE ONLINE it doesn't really matter
EDIT: link now added and here is a bit of info:
Head Back To The Streets Of Sin City In An Explosive, All-New Adventure And End The Terrorist Threat Once And For All:
Play co-operatively with a friend through the Single Player campaign or with up to 15 players on Xbox Live.
Use the enhanced 'Cover and Shoot' system to protect yourself from the onslaught of enemy fire.
Create a unique and personalised Rainbow Six character that evolves on and offline.
Unlock rewards as you play through the Single Player campaign and Multiplayer modes.