- The Certificate of Free Sale is one export form you may need to provide. It provides assurance to the customs authority of the importing country that the items listed on the certificate are the same items manufactured in the United States and sold here without restriction. They presumably meet all state and federal laws and regulations. It provides that assurance because the form is certified by a U.S.-based chamber of commerce. Some countries may require the certificate of free sale from a government agency such as the U.S. Food and Drug Administration (FDA) for certain products. certificate of free sale fda