One of the more frustrating parts of the game is trying to find where you accidentally sold an item to get it back.
Instant Gold Sink to solve this problem:
Go to Withers who will cast Locate Object as a ritual spell for 500gp.
The player is then given a temporary "container" with a search function that searches the inventory across every trader the player has visited and they can search for items they sold to those vendors. Extra points for listing the closest fast travel sigil.
Have it be in effect until the next long rest just by querying Withers again.
