Cheapest I can find delivered at the moment and with a possible 9% quidco could bring it down to under £90.
* Controller-free gaming and entertainment. Kinect provides a whole new way to play - no controller required. It uses a sensor to track your body movement and recognise your face, even listen to your voice. If you know how to move your hands, shake your hips, or speak, you and your friends will be able to jump instantly into any Kinect experience. Comes with Kinect Adventures where you can explore the world from the comfort of your living room. Jump, duck and dodge in beautiful mountaintop obstacle courses, test your reflexes in Rallyball, or experience anti-gravity in outer space. With 20 adventures to complete, there is plenty of action to go around.
* Age - 3+