In order to receive your order in time for the start of the Winter Quarter please call our Customer Service Department for Overnight Saturday Delivery shipping option. Otherwise, your order will be processed in the order in which it is received, which does not guarantee that you will have your order in time for the start of the Winter Quarter. We CANNOT ship a package express to a P. O. Box. If you have any questions or need further assistance, please feel free to complete asupport ticket hereor call us toll-free at 1-877-746-8578.