Hi @Auto-Pilot. I looked at the Appointments settings for Customer Notifications. There is a list of variables that are currently allowed in notifications (see screen shot below). Unfortunately, the cost of the appointment is not included at this time. All I can suggest is for you to head over to the Ideate Board and submit a feature request to the Appointments team. They will review it, ask for input from other sellers, and make a decision about whether or not they want to add it to the product roadmap.
Good luck!
