How much dealers charge is based a lot on where you are, and the individual dealership's policies. The 22.5K maintenance isn't a big one. Based on what I would expect from my dealership.
- Oil and Filter Change - $30.00 (May be a disposal fee of $5.00 too)
- Rotate Tires - $20.00
- Road Test Vehicle - Free
- Laundry List of Inspection items - Free
At my dealership they inspect all the items listed every time the car is in there regardless of the schedule. The only additional chargeable item to the oil change would be the tire rotation.
You can call them and ask them their prices for the 22.5K scheduled maintenance. There are definately no "we won't know until we get into it" items.