Very cheap for a CoD game, looks to be pre owned so keep that in mind. Some of the older CoD games go for £10 / £15+ so you could sell it for more than £5.47 i'm sure. Link: http://www.play.com/stores/zoverstocks/listing/736424493
Sometime ago I bought MW3 from Play.com through Zoverstocks and in terms of disc condition, case and all it was in excellent condition but I just couldn't get in to the game. I sold it on Amazon eventually. I thought the rankings and everything else would be transferred to the newer version like it is on FIFA, but I was wrong. Graphics looked great but the maps were different, guns and overall MW2's my favourite.
Great to know the condition should be great then! I do agree though MW2 was by far the best campaign and multiplayer wise. The only other things games have after that is that you can play on Xbox Live with two people on one console.
During the start I did play the campaign mode, but time after time I'd just play online because that was where the fun is. Small note: If Zoverstock sends a faulty product (whether this, some other game or whatever), let them know, allow them to reply back and it will be solved.