I found this at the Bristol PCworld/currys store
3 month xbox live on the shelf for £12.99 which is cheaper than ebay and the normal rrp price!
Surely you can price match if you have a comet or something near by!
Might be nationwide but im not sure
EDIT: - IF YOU HAVE A £5 VOUCHER FROM THE GIVEAWAY - YOU CAN GET IT FOR 7.99!