We currently use UPS, USPS, and FedEx to ship our orders. We use the carrier that offers you the best rate in order to keep shipping costs down. If one of these carrier does not ship to your address, please contact support@afcultures.com so that we can ensure that your order is delivered on the first attempt. Please Note: If your order contains a 30" and 36" sized item, we will not be able to ship your order to a PO Box.If you request a preferred carrier, additional shipping costs may apply.