Don't know anybody in the area that does tint but I paid about $280 to tint everything but the windshield on my 2007 (with 3M Color Stable film which is a bit more expensive). My sister in law just got her A4 done in San Diego for $340 out the door (ceramic tint, everything but the windshield).
A non ceramic will be cheaper but IMO ceramic is the way to go. Wont interfere with the radio, GPS, Sattelite Radio, cell phone etc and blocks lots of heat. Metalized will block lots of heat too, and is cheaper, but can interfere with the electronics reception in the vehicle. Regular dyed film won't interfere but it also won't block as much heat.