Popped into my local GAME this evening and saw 1200 MS Points going for £4.98. Pretty good deal, these were sitting alongside the 800 MS Points for £2.98 - an even better deal if you can find it.
Ended up buying 10,000 MS points for £38.78. To put that in perspective, HMV sell 4200 MS points for £34.99.
Bigger image: http://p.twimg.com/AnfytiJCEAAQTAX.jpg