US Combined Shipping: Most items that are in stock (not pre-orders) are flagged to charge shipping based on the total weight of all items – therefore eBay will automatically combine shipping across multiple items. Typically each movie adds less than $1 additional shipping costs. ! However, if more than a few movies are purchased; significant saving can be obtained by shipping Media Mail. For example it costs as much to ship 15 disks by Media Mail as it does to ship 4 disks by First Class. To change to Media Mail, I have to override the order before you pay. The best way to accomplish this is to load all your items in your cart and request an invoice before paying. Some mobile apps do not have the option to request an invoice. However the regular web based eBay interface does. I can also combine pre-order shipping – I need to know how you would like those combined (because they potentially ship on different dates) and you would need to request an invoice. Because shipping costs are a large portion of the total cost, combining shipping is a smart way to shop and save money!