Sliding Scale Payment Option

I would like to be able to offer my services sliding scale. Ideally when creating a service I could enter multiple payment levels, then on the front end there would be a dropdown menu with multiple payment levels for a single service so that the customer can select what they would like to pay. For example, I offer my services at three different pay scales, the first is $150, the second is $200, and the third is $250, this allows people who can't pay full price to access my services. Right now I have to use coupons to make this possible. Here is an example of a website that uses a dropdown box for sliding scale pricing: https://www.narrowbridgecandles.org/collections/spring-collection/products/spring-ritual-box