I drive a Saab, and several months ago it experienced a fairly common failure related to the cabin blower motors. The dealership wanted to replace with all new dealer parts from Sweden, and provided a ~$1400 estimate.
My independent mechanic, who tells me he deals with this particular issue on a near weekly basis, told me that the part I needed was identical to a part found in earlier Cadillac Cateras. Just by using that part, he was able to fix my car for $680 -- over 50% savings.
Maintenance by the dealer can often be significantly more expensive, and there's almost always a competent independent shop nearby that specializes in your car.