I had rotex pads put on last spring and after calling around, I had one local chain garage tell me that they only install parts that they supply. I suspect that they want the outrageous mark up on the parts. I ended up having my pads installed by the dealer. They also made sure to give me back my old brake pads because they only had 10,000 miles on them. The interesting thing was that the price difference between the dealer and local shops was negligible.

Moral of the story - check with your dealer, they'll probably do it at about the same price as any independent garage.