While shopkeeper NPCs are not enabled to buy every item in Limitless, there is a small number of items that can be sold:

Item	Price
Amulet Coin	₽10
Nugget	₽10
Pearl	₽10
Relic Copper	₽10
Relic Silver	₽50
Big Nugget	₽100
Big Pearl	₽100
Relic Gold	₽100