The reason most salons charge for each service is because each service costs money ie toner glaze color refreshing. Also a blowout takes 20-30 minutes yes? In that time we can book colors etx. So if a place does a blowout for "free" it's incorporated in the color cost. If it's simply dried with no brushes or styling that should be included complimentary with an assistant or if your stylist has time. In very good salons the products they use are insanely expensive thousands of dollars a week at least As a colorist myself I have to pay for product each time o do my hair and it costs more then one might think