The price of any steel product of domestic origin is not unreasonable if: The price does not exceed the sum of the bid or offered price of a similar steel product of foreign origin, plus a differential of 20 percent of the bid or offered price of the steel product of foreign origin; or The steel product is produced in a “substantial labor surplus area” as defined by the United States Department of Labor and the price does not exceed the sum of the bid or offered price of a similar steel product of foreign origin, plus a differential of 30 percent of the bid or offered price of the steel product of foreign origin.