Expensive! - There are quite a few "wifi repeaters" that also provide an Ethernet port
http://www.amazon.co.uk/300Mbps-Wire...2YFWRF5PKJPGCB
Maplin also have one
http://www.maplin.co.uk/p/tp-link-tl...extender-n38nt
Aldi did one a while back, and theirs had the option of switching modes, so it could be a repeater (with Ethernet bridge), an Ethernet bridge with no repeater, or an access point.