Well that price sounds a little high. If you're willing to do some shopping around and doing the work yourself you should be able to do it for under 200.
First; I would check to make sure you do in fact need a new power window master switch. You'll need a multimeter to do this.
Take off both the driver and passenger side door panels. Unplug the passenger side motor and have a friend start the car and flip the window switch for the passenger side. With the passenger motor unplugged hook up your multimeter and figure out what the readings for the motor should be. Now repeat the process on the driver side to see if you're getting the same power through the wires.
Simple math here, if the multimeter showed power on the passenger motor but not the driver side then you know you need a new switch. If do get the same power on both sides then you should get a new motor instead.
For a new switch I would get one from ebay or a local junk yard.
If you have power then you need a new motor, I would get one from an auto parts store, but if you really need to save money then junk yard that part as well.
As for sluggish windows; replacing the motors should fix this.