that's a million dollar question. Guess it depends on the dealer and what all they replace/don't replace.
If you're looking for a TB replacement you might want to talk to some local folks on here and see if there's someone close by that would be willing to do it for you. Typically money can be saved and the folks here doing the change are usually more thurough with the job. They can tell you exactly where to get parts and part numbers. Or you can visit one of the club members that sell these parts (
Dieselgeek for example), and they will be on your doorstep in about a week. (the parts that is)
There have been horror stories about people taking their cars to dealers and not getting the appropriate items replaced (ie: water pumps, upper and lower rollers and TB tensioners, engine mount bolts, etc.) and STILL charging the customer $600+ for the change. Hence the name "stealership".
It's up to you. Maybe someone close to you can chime in here if they're willing to help out with TB change info? You might want to update all your info so people know where your from year and model of TDI.
Good Luck, J