For domestic shipping, we use either UPS or USPS. For international shipping, we only use USPS. Since customers are responsible for actual shipping charges, we do our very best to use whichever options within UPS and USPS that allow for the lowest possible charges. With regards to international shipping, please note that we are not repsonsible for any additional taxes or duties that may be incurred. Also, we can inform you of the USPS estimated delivery date but cannot guarantee a specific delivery date since delays, although infrequent, can happen and are usually due to packages being held up at customs.