What is the least expensive shipping method can vary depending on factors such as the size, weight, and destination of the package. Generally, the least expensive shipping methods are standard or ground services offered by carriers like USPS, UPS, and FedEx. For example, USPS First-Class Mail is one of the most affordable options for small, lightweight items, while UPS Ground or FedEx Ground offers economical rates for heavier packages. Choosing the least expensive shipping method often comes with longer delivery times, as expedited services like overnight shipping or express services come with higher costs. Comparing shipping rates and delivery times can help determine the most cost-effective option.