Tail lights won't turn on, but brake lights, blinkers, hazards work fine. on 2008 Scion xB

I had a friend notice that both of my tail lights are out on my 2008 Scion xB. I went to the store and replaced both tail bulbs immediately. Then I realized that the blinker, hazards, and "blinking" when I lock/unlock with the remote are all the same lamps, and they function. So the bulbs are fine, but they just don't come on as tail lights.

Asked by for the 2008 Scion xB
with your taillights turned on take the bulbs out and check the sockets for power and ground if you have no power its probably in your headlight switch
Thanks! I will try that. Not having much luck trying to find where to order that part online - would a big chain auto parts store have one?
I am from canada so I dont know where to go to get the part but I would say any auto parts store should be able to help you out