This is the cheapest i've found the superb messenger keyboard. RRP is £24.99, but this is £14.80 plus £2.62 delivery.
Chatting with friends and family on Xbox LIVE® and Windows-based PCs is easy using the Xbox 360 Messenger Kit. This device easily connects to any Xbox 360 controller and provides easy to use chat capabilities while maintaining gameplay functionality in one easy-to-hold device. The Messenger Kit includes a Chatpad and Xbox 360 Headset.
Chat on Xbox LIVE with ease featuring dedicated keys to letters and characters.
Don't hamper your stylethe Xbox 360 Chatpad attaches seamlessly to your Xbox 360 Controller.
Backlit buttons allow you to accurately type words even in dimly lit environments.
Messenger Kit includes the Xbox 360 Wired Headset for the ultimate communication bundle.