I've just been into my local Currys (Livingston) to see if they had any of the Singstar games in stock (as mentioned on another thread), and whilst I was looking I noticed they had this on the shelf.
Socom Confrontation - Including the official PS3 Wireless headset
And all for the tiny price of £19.97! It is still showing as £39.97 online.
I'm just off now to cancel my order for the headset I ordered at play.com.
Hopefully this is a nationwide offer, and it can benefit others. There was only one on the shelf at my local, don't know if they had any more behind the counter though?