Add all items to your shopping cart and request your combined shipping invoice from the shopping cart screen prior to completing your purchase (may not work on mobile apps). If purchasing items using offers you must make sure the auto payment option is turned off when you make or accept the offer. We do not guarantee we can combine your order if you wait until after you have completed the purchase of some or all of your items. We cannot hold items even if some of your order has not yet been paid for. All paid items are shipped the next business day unless there is a post office holiday. Combined shipping is not available on international orders.