Free standard shipping via USPS First-Class Mail will be automatically applied to all orders; no promo code needed. Offer valid when shipping to an address or P.O. Box address in the Contiguous United States and the following areas: U.S. Territories, Military addresses/APOs, AK, HI, PR and some rural areas. USPS Priority Mail and Priority Mail Express shipping services are available at checkout for an additional cost. Click here for more information.