Costco offers members an opportunity to purchase one-ounce gold bars in the store, online or via their app. The retailer offers gold bullion bars, 1-ounce bars and coins in different designs.

Last year, Wells Fargo estimated that Costco was selling between $100 million to $200 million worth of 1-ounce, 24-karat gold bars a month. James said Costco is more interested in providing a good ...