I've heard about Audi parts and service.
$90 for the dealer to get to the headlight bulb on an A4.
I have an A4 and it takes a screwdriver to replace the right headlight bulb. The air intake scoop is placed above the headlight. It is a 10 minutes job, but I don't know whether the mechanic charges fraction of an hour. Audi mechanics here are about 60-70 euro/hour -about $80-$90-
The only original parts I buy are specifics such as a broken door handle and the like. For the rest, I buy Bosch filters, Mahle oil filters etc -in fact, most of the parts are made by external manufacturers and rebadged as Audi. You can get prices up to 50% cheaper. Brake pads, discs, you name it.
Obviously, over here it is not an "exotic" car so it is easier to buy parts at the places similar to your Autozone without receiving startled looks.