Cheapest wireless keyboard plus mouse

[unwashed potato!]

i am making a linux ubuntu pc atm and would like the cheapest of all cheapest wireless keyboard and mouse to go with it. Anyone know of any i can get, hoping to spend at most £15 for both + delivery. I know a shop cant be posted but what about the actual keyboard and mouse to get. I dont know if this matters but would obviously need to be compatiable with ubuntu.

anyone?

thanks chappys