D-Link PowerLine AV+ Network Extender Mini Adapter Kit $20 shipped (Reg. $35), more
D-Link PowerLine AV 500 Mini Starter Kit, Turn a power outlet in your home into a Network connection, Up to 500Mbps, Plug and Play, Power Saving Mode, Includes 2 Adapters (DHP-309AV) :
Amazon.com: D-Link Powerline Adapter Starter Kit Ethernet Over Power Gigabit AV2 Up to 1000Mbps MIMO Internet Network Wall Plug In (DHP-601AV) : Electronics