Went in Thurrock Game the other day and wireless headset was £24.99 with a few in stock, don't have a clue if nationwide, or if you're able to price match elsewhere but this is in the Thurrock Shopping Center Game
The Xbox 360 Wireless Headset integrates seamlessly with the Xbox 360 console to provide wireless voice chat, stylish ergonomic design and superior voice quality over the Xbox Live network.
Now gamers can pair this and the award-winning Xbox 360 Wireless Controller for the ultimate wireless experience. Gamers can use up to four Wireless Controllers and Wireless Headsets simultaneously during multiplayer gaming sessions.
* Enhanced voice quality over Live
* Super comfort!
* 8 Hours battery life per charge
* Use up to 4 on one Xbox 360
* 30 ft un-interrupted range