I have a form that has multiple checkbox items. As shown below:

Eventually I want to send someone a cost associated with each of these selections. For example, if Lab1 is worth $5, Lab 2 is worth $10, and Lab 3 is worth $15. How can I connect these prices to the checkboxes? I want my flow to add up whatever they select, but I'm not sure how to have the costs associated with the checkboxes. I thought about just adding them as variables in my flow, but there may be hundreds of these. Is there a way to create the checkboxes from a spreadsheet, and then have the prices add up somewhere later? What is a normal workflow for this?