TP-Link AV1200Gigabit Powerline Starter Kit. Uses existing electrical wiring in your house to turn a power outlet into an ethernet connection.
I have 2 of these for sale (each has 2 adapters). $40 each, $75 for both.
HomePlug AV2 standard compliant*
Line-Neutral/Line-Ground 2×2 MIMO with Beamforming ensures larger range, higher transmission capacity and more stable connections
Gigabit port provides secure wired networks for desktops, smart TVs or games consoles
Plug and play, no configuration required
Patented Power-Saving Mode automatically reduces power consumption by up to 85%**