$10 · 2 D-Link Powerline Adapters

When you need Ethernet, you can use the electrical wiring already running through your home. Powerline adapters connect devices to your network via your existing electrical sockets. You need one adapter to connect your router to a nearby power socket, and an additional adapter that plugs into a socket in the room where you need the physical connection. You then connect your device to the powerline adapter using an Ethernet cable. - Up to 200 Mbps