Was going to go thrift store shopping but then I remembered that thrift stores are full of people with Amazon/eBay price scanner apps scanning everything for resale.
I have friends who worked for Goodwill, and let's just say their actual mission is "donate just the minimum required to obtain tax cuts while 'reinvesting' in the company and paying execs millions while claiming we support the community."
You should "Scan" the person (with the scanner app) with your phone....Then if they ask, You tell them you're using a scanning app to check value. Then tell them they're not worth much.