The cost is borne by the buyer. Because Amazon's expedited delivery service is a paid value-added service, if the buyer needs to receive the goods quickly, he or she needs to purchase the expedited delivery service and pay an additional fee. Otherwise, Amazon will deliver the goods for free according to the regular delivery time. It is worth mentioning that Amazon will regularly launch promotional activities, such as free expedited delivery for purchases over a certain amount, etc. Buyers can pay attention to relevant promotional information to reduce the burden of delivery costs.