We offer a variety of carriers and shipping methods on our site that may change from time to time. Which options you see will depend on a variety of factors from the weight and dimensions of your order to the final destination.
If you choose a Free Shipping option, our automated fulfillment system will always choose the carrier that will get your order to you as quickly and cost-efficiently as possible to help reduce the carbon footprint of your shipment. If you choose Free Shipping, we aren't able to notify you of which carrier will be used until your order has shipped (PO Box addresses will ensure that a PO-friendly service is used). If you require a PO Box, please make sure to use the text "PO Box", and not "Unit", etc. so the system knows it's a PO Box.
If for any reason you are unable to receive packages by USPS (or any other specific carrier), please make sure that you choose a paid shipping option with a carrier that you know will deliver for you.
If you choose a non-USPS service but still enter only a PO Box address, your package will likely be undeliverable and will need to be re-shipped at your expense.
If you have any questions about shipping methods or services, don't hesitate to ask!