Having a brake shop or auto repair shop replace the brake pads and rotors on a vehicle can cost from $200.00 to $300.00 per side.
Brake rotors can cost from $50.00 to $70.00 each then the brake pads are around $25.00 to $40.00 per set but shops do increase the price of the parts due to markups to make money.
Having all four brake rotors and all brake pads replaced can cost as much as $1,000.00 including parts and labor and if you can replace the brake rotors and brake pads yourself you can do so for around $100.00 to $200.00
Replacing the brake pads and rotors is a pretty easy job and you can find videos on youtube on how to replace the brake pads and rotors but if you're uncomfortable do so then have a shop do the job to be safe.