Am expecthing things to get a bit cold in here for a few reasons. 1 reason not a lot of stores have it. 2nd reason is there is only 7 in stock online at the time of writing this. 3rd reason is because some people don't like pre-owend headsets. But it might be useful to some people.
So anyhow CEX are selling Socom Confrontation with the official PS3 wireless headset for £15 delivered or £15 instore (check to see any instock in your local store)
Plus if you live in Sunderland they have 1-3 of Endwar + official for £12.