Try http://www.cars.com/ You'll get a good idea of the cost.
Replacing Disc Brake Pads ** Caution *** Older brake pads or shoes may contain asbestos, which has been determined to be cancer causing agent. Never clean the brake surfaces with compressed air!...
see link
It cost me $268 to do the cylinders on both wheels at Pep Boys :-(
Generally, the lense has small tabs on it that can be gently pried out to get access to the bulbs.