I've just had mine done. Expect around $350. I have prepaid my services until 12,000 miles/2 years for $1,300 for piece of mind. A very big difference on how she runs after the 600 mile service. She runs smoother now and feels like you've ben hit by a 747 jumbo jet when you squeeze the throttle. Expect some unplanned wheelies specially on second gear with spirited driving. Just what a Ducati is supposed to be.
I feel like a dork now for paying a service that Ducati is giving for free. Anyways, the free service is only for the first year and at 7500 miles.