Generally, the cheapest way to send any parcel internationally is through your national postal service using their economy or surface mail options. Services like USPS Parcel Select, Royal Mail International Standard, or similar offerings from other countries typically provide the lowest rates, though delivery takes 3-6 weeks. For domestic shipping, ground services are most economical. Consolidation companies that batch shipments together can offer competitive rates for non-urgent items. Comparing rates across multiple carriers using online shipping platforms often reveals savings. Reducing package size and weight by removing excess packaging helps minimize costs. For larger items, freight services or bus cargo services may be cheaper than traditional couriers. Avoid expedited or express services unless necessary, as these carry significant premiums over standard shipping.