For sale is a Cisco Linksys Powerline networking kit. This is a great, simple way to extend your internet connection to a room in your house that has bad Wi-Fi.
It uses your home's existing electrical wiring to transmit the internet signal, so you don't have to run any long cables.
How it works:
Plug the main adapter (PLE400) into a wall outlet near your router and connect them with an Ethernet cable.
Plug the second adapter (PLW400) into an outlet in the room where you need better internet.
The second adapter will create a new Wi-Fi network and also has an Ethernet port for a wired connection to a computer, game console, or smart TV.