Aldi will have this remote control plug sockets set instore from Sunday 17/11/13 for £17.99 which seems reasonable enough.
Product Information :-
Safely switches lights and electrical devices on and off around your home to your chosen settings.
Manual on/off function for 4 separate sockets
Learn code setting and blue LED indicator
Range up to 40 metres
Master function for general on/off switching of connected sockets