I got quoted about 220 bucks for the tune up I plan on getting done here pretty soon.
Since I don't know the repair history, they just went on how many miles it had. They had a little guide that said what to do at what mileage intervals, and since my bike happens to have 22k on the clock, it gets the whole deal.
I think I remember them saying that it includes chain adjustment, valve adjustment, carb cleaning, carb balancing, fluid change, filter change.....uh...I know there's more...but I forgot what it was
Anyway, hope that helps a little. Good choice as a first bike too, so far I love my GS

(only had it for a couple months, only been riding for a couple weeks)