So, in my city, there's a warehouse, they buy Amazon returns and surplus in bulk, every week on the same day, they fill shallow elevated bins ideal for picking through with the items. Day 1 everything is $25 an item, the price reduces each day until everything is $1 on day 7. It is a great low cost (it's actually profitable), probably profitable enough that if Amazon ran these themselves they could pay to process all the waste in an eco friendly way and not lose money.