Where do I buy powerline internet accessories?

Question

My wifi at my parent's house is really weak even with the antenae extenders. What is the device called that allows you to plug your router into a device that shares the internet via plugs into your power outlet? I'm looking for this in Toronto, canada and not sure where I can buy it or what it's really called. I know that the slingbox has something similar that they offer so that you can plug your slingbox near your tv and then into the power outlet then to your router in another room without having to go through wifi.

Answer 1

http://catalog.belkin.com/IWCatSectionView.process?Section_Id=201539