Pricing Slider Using Sass and a bit of JavaScript

Hey guys. I think this project was a little too ambitious for me. I did learn a lot, but I'm sure I wrote some terrible and inefficient code. I would love to get any sort of feedback on things I could improve. The thing I found the hardest was the adaptive slider. I just used a basic switch for each value of the slider. But is their some other, more efficient way, to update the price, without having to use switch or basic if-else statements? Thanks.