Currently £34.99 for new (average price is £47.60) but lots of Used - Like New and Used-Very Good (even cheaper) available with the 20% discount being taken off at checkout. Personally i always buy network extenders with pass-through so you don't lose a plug socket.
Bring the internet to your devices
Works with all Broadband providers
Pass through socket means you don't lose an electrical socket
High speed (AV500) data transfer, multiple HD/3D TV streaming
Works straight out of the box
How it works-The Broadband Extender Flex 500 Kit from BT is easy to use. Simply plug into your wall socket and link with your router and you are ready to enjoy broadband all around your home