The default shipping method (within the USA) is US Postal Service priority (2-day) mail. This is included in the price.
Contact Sinc Squared for price quotes on other shipping options, such as overnight or international. Use this "Additional Shipping" option to add the quoted shipping fees in increments of $5.00. For example, if the additional shipping charge is $35.00, add quantity 7 units of $5.00.