what shipping method is cheapest depends on the size, weight, and destination of the package. For small and lightweight items, services like USPS First-Class Mail or UPS SurePost may offer the most affordable rates. For larger or heavier packages, options like FedEx Ground or USPS Ground Advantage can provide cost-effective shipping. E-commerce businesses should compare different carriers and services to find the best shipping method for their needs, balancing cost and delivery speed.