I sold some postcards to a gentleman in Hong Kong. When I quoted him the mailing cost (which I got from the post office) he said that was fine. When I mailed the cards I got a different teller at the window. Not only was the price $5.00 cheaper, but was shipping "faster" than the first quote. The gentleman in Hong Kong was surprised and quite happy when I E-mailed him and told him I was returning $5.00 U.S.A. dollars to his paypal account. I always thought that sometimes it depended on which clerk I got at to the difference in the shipping.