There is no price because each specialty coffee has its own cost. Specialty coffee is included free only with the plus, premier, or zero alcohol packages. See the T&C’s (one link is attached) that state “cannot be used for minibar items”. The stand alone coffee package with 15 coffees that previously could be a mini bar trade has been discontinued as stated in previous posts.
https://www.princess.com/html/global/personalizer/ssv/beverages/zero-alcohol-package-disclaimer/