There are none. But, if you want to sell valuable items at the PokéMart in Pokémon Sun/Moon, you should go to Poni Coast and break rocks with Charge Tauros. You will have a chance of receiving Stardusts (sell for P$1,500), Star Pieces (sell for P$6,000), and/or Comet Shards (sell for P$10,000). Another way you can find valuable items to sell are through the use of Pick Up. You will have a chance to find Balm Mushrooms (sell for P$7,500), Pearl Strings (could also find this through Fishing / sell for P$15,000), Nuggets (sell for P$5,000), and Big Nuggets (sell for P$20,000).