$ First Class Shipping (within the United States) up to 13 ounces.
$ Priority Shipping (within the United States) anything over 13 ounces.
$ First Class International Shipping (outside the United States) up to 4 pounds.
$ Express Mail International Shipping (outside the United States) more than 4 pounds and/or higher priced items.
$ Economy Shipping (within the United States) for books or other media resources.