Saw this instore @ Asda Spondon, Derby, original price £10 as already listed on another post but now reduced to £5.
Also on offer for £5:
Microsoft Comfort 1000 optical mouse
Microsft webcam (sorry didn't pay attn to the model no)
Microsft VOIP headset
Not sure this is nationwide as popped into another Asda and all the above items were £10. Hope this helps someone!