This is something I've seen on sites like Poshmark where people will post about what they're "in search of." This would be a fantastic feature for Pango to integrate.

There are several books that I've spent years looking to buy a specific cover where this feature would be super useful; on the flip side, as a seller, if I happen to have something that someone is looking for that I hadn't been planning to sell, this would be a great opportunity to make some cash.