The obvious answer to this is that there is a solution for that ... a pawn shop.
But I don't think that works for many situations. #1) I don't want to haul the items to the pawn shop ... just to have them rejected. I guess that brings up an interesting idea .... pawn shops could have a role in this need .... ie. electronically approving items .. or having virtual items.
I'll often take items to the Local Re-Use center ... and just give it away.
Anyone ever heard of a pawn shop ... that you can send descriptions and pictures to ? And they will approve or reject them ?