Through our Custom Wi-Fi service, techs install a combination of D-Link DHP-P610AV, DHP-W610AV, DHP-W611AV and DAP-1620. Those devices are freely available in the market and can be used to extend any WiFi network.
They're about 85$ in most stores, but Videotron bills 75$ a piece with free install, through said Custom Wi-Fi Service. Tech support can set the service call for you.
Cheaper devices do exist, but cheaper isn't always better!