i dont think they do having used them a few times. although i think you can kinda do it by changing the shipping address when you buy a item.
although word of advice, use the shipping calculator and fiddle with it, you will find its very expensive for 1 item, but stays about the same the more items you buy at the same time, ie 1 item has $40 shipping, but 2 has $40 too, making it $20 each.
so trying buying in bulk, it works out for more profits