how to ship big packages cheap involves selecting the right shipping methods and carriers to minimize costs. For larger packages, USPS offers flat-rate services, while UPS and FedEx offer ground shipping options that are often more economical for bulky items. To reduce shipping costs, consider using freight services for large shipments or consolidating items into fewer packages. Additionally, comparing rates from different carriers and taking advantage of shipping software or volume discounts can help you find the best price for shipping big packages.