In a discussion was noted that selling 100 goblin bows for mass money should a losing game eventually. Your stores should not want that junk (and should throw mass items away).
So 'junk' bows, goblin clubs, staves, etc? Once you've sold 3-5 to a store, they should devalue or depreciate in value.
Obviously actual valuables should not. So gems, statues, artwork, metal bars should stay the same value as always.
Even low grade armor like generic leather armor would be easy to figure out.
