Yeah, it depends on what you mean by "broke." If it's still in track but just won't power up/down but all the other windows do, it's likely that something may have just come loose. Or the motor could have crapped out. Stay away from the dealership though. I'd just ask friends/coworkers if they know of a small, but honest repair place.
FYI: Replacing the regulator/tracking is pretty easy. The left rear window on my Nissan went out a couple years ago. I bought an aftermarket replacement kit on Ebay for $25. It was brand new, had the full tracking kit and regulator. After Googling for some instructions (there are lots of detailed tips online), I manage to install the new system in less than an hour. Works great now. The Nissan place quoted me $410 to do the exact same thing I did for $25. :roll: