I normally pay around $70 something. Last time I had it in, it was only around $40. I normally get a rough estimate before leaving based on anticipated services (IE, basic cleaning/tune-up). I usually take mine in once a year before my fall quilt camps/retreats to make sure it's in good condition. Nothing like getting 7 hours from home and not having a working sewing machine.
I have a Husqvarna Viking 990 SLE from the 80's (one of the early computer models). The last two times I've had it in, I've gone to the newer quilt store in town, which happens to be a Bernina dealer, instead of the local Husqvarna Viking dealer. They have a quicker turn-around time (the first time it was ready same-day, second time the next day) while the Viking place takes a week or more. I think the Viking place is just a drop off for a repair man while the Bernina dealer actually has a repair man on staff. He's in several days a week and will often work evenings while his wife teaches classes at the store.