Looking for a reverse ecommerce template

Are there any themes that I can have people sell their devices on, it calculates their pay, and pay them for their used devices? Its like a reverse ecommerce. Not sure of the name for it. Thanks

You may need to be a bit more clear

Here’s an example. Where someone can sell their used device and get cash for it. It prices the device out depending on condition.

https://www.itsworthmore.com/

You should be looking for “price calculator” extensions/features