least expensive way to ship a package depends on several factors, including the size, weight, and destination of the shipment. For smaller packages, the most cost-effective shipping options are usually First-Class Mail through USPS or economy services like UPS SurePost or FedEx SmartPost. For larger items, ground shipping is typically the most affordable option. International shipments may require services like USPS First-Class International or DHL eCommerce. Shipping costs can also be reduced by using flat-rate boxes, which offer predictable pricing. To save money, it’s important to compare different carriers, consider delivery times, and check for discounts or promotional rates available through third-party services or membership programs.