From my understanding the local postal service allows the merchants to buy postage by weight. Eg. 100 pounds at a time for ~$20USD. A merchant can then split th

From my understanding the local postal service allows the merchants to buy postage by weight. Eg. 100 pounds at a time for ~$20USD. A merchant can then split the purchased weight over as many shipments as they want. The ultimate result is the cost of shipping per light-ish item is in the cents. The shipment is slow, and little or no tracking.