These websites can be used to sell instead of StockX.  eBay: Possibly the most well-known option among them all, you may sell items at a set price or make them available for bidding.  A website that sells both new and worn sneakers is GOAT.com.  Poshmark lets you sell watches, handbags, clothes, and shoes.  ThredUp: A marketplace for buying and selling at consignment shops.