It is not really cost effective to repair a power window motor unless you are skilled with small motors and can do the work yourself. Replacing a power window can be quite cheap if you can do the work yourself. New motors can be purchased or ordered at the majority of auto repair stores. You can often find workable used motors at local parts recyclers or online. If you are not capable of doing the work yourself, a repair shop should be able to get the work done for $100 or less. The rates will vary on make and model of the vehicle, but in general, the repair should not take much more than an hour.
For more info, see Average Cost to Replace a Power Window Motor for a Sedan