Custom duty taxes depend on the product and country of origin. Checking the custom duty on a specific item using the Harmonized Tariff System manual is preferred. The HTS contains all the duty rates of known items and is a reference manual for professionals and beginners alike.
Another option is using an interactive system named the U.S. International Trade Commission-Tariff Database to get an approximate duty rate. As of 2014, the countries of origin that benefit from reduced or free custom duty rates include sub-Saharan African, Andean and Caribbean countries, Israel, Chile, Jordan, Singapore, Mexico and Canada. Mailed or shipped goods are duty-free ranging from $800 to $1,600 if they originate from a Caribbean Basin Initiative country or an insular possession country.