Most items ship via Priority Mail. For items that will fit into one box without going over one pound, we charge only one full charge and refund excess shipping over the additional item fee. For orders that weigh over one pound, we choose the least expensive means of shipping via Priority Mail. Any excess shipping charges are refunded as applicable. Most often the shipping costs more than the customer ends up paying on items over one pound. First Class items are calculated based on weight so discounts are not applicable. When you go through the process of buying multiples of one product, you will see that we do combine shipping.