What is this item worth to you?

Here are a couple of options that may be worth a look:

Smart Donations: https://www.ads-software.com/plugins/smart-donations/
Tiny Coffee: https://wptavern.com/tinycoffee-a-simple-elegant-donation-plugin-for-wordpress

Jackie,

Thank you for your quick response. While these are great for donations – and I thank you for sharing them with me – I was hoping for a cheap/free commerce solution. I want to put up a few ebooks on my website and want to offer people the opportunity to either download it for free OR offer an amount of their choice.

Have you tried EDD?

Ohh I like it, thanks Dzikri Aziz. I wonder if there is a demo of this available? I cannot seem to find one.

The smart donations plugin has a slider just as you want. That would be your best choice.

Excellent, thanks all.