Going through the same issue myself, I'm going to replace the windows soon anyways, because one doesnt work and the other needs extensive help to come up.
Does your dash lights dim if you hold the vert windows up or down? If so, it probably isn't the switch since it is pulling power. The bushings in the motors tend to take a **** in these cars so that could be an issue too, which just is $7 a side at your parts' store.
I couldn't tell from the original post. Did both rear windows quit working at the same time? If so, this more likely to be an electrical issue. Especially in the rear window lock out switch on the door.
Recommend confirming that the window motors are good/bad. The window motor connector is somewhat easy to access by removing the inside trim panel. Power the motor directly from +12 volts to confirm functionality.
I'm doing both motors. I might as well, I have bushings I am going to put in too though if the new motor (I bought a used one for the slow retarded one) doesn't have them included.