How to remove the cost value if there are 2 of them when ordering?

hello everyone, please tell me how to do it: i have 2 ad prices inside my app, how can i cross out or invalidate one of them? let’s say 1 starting price, 2 special price and I want to pay only the special price, how to make the user see and be able to pay only one price and this value was contained in the payment button. thanks for every answer