Shipping prices vary based on location, speed of shipment and shipping company. These can be selected at the checkout and the prices are calculated by shipping company (USPS, UPS, DHL, ...).
Business days are defined as Monday to Friday. Holidays, Saturday, and Sunday are not included in shipping days.
USPS will ship to PO boxes within the US. However, expedited shipping in the US or an address located outside of the US requires a physical address.