what you want is called EOP...Ethernet over powerline. It consists of two units that have an RJ45 receptacle and a powerline plug. You connect one of your router's ports to one of these devices and plug the device into the power receptacle in the wall. At the other end, you plug the second unit into the wall, and connect a CAT5 cable to its RJ45 and presto, you have IP at that line now. It uses your house electric lines to transmit.
NetGear, amongst others, makes these...model# XET1001. RadioShack has them for about $60 for two units. You can add-on more units and spread your coverage all over the house. I have a pair of these and I use them to connect my main router to a remote WiFi access point downstairs and it works very well. Beats the hell out of running cable.
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