Did you go all the way to the last page of checkout? This is where shipping is removed. I tried a variety of items, some listed shipping (remember it has to be over $49 so if you are on an item page and that item isn't over $49 then you will still see a shipping charge), I got to the final page of checkout, and all the shipping was removed.
When I switched to delivery to my US dropshipper address, the price of the goods was the same, but there was a delivery charge for two of the items - so it was actually cheaper to have it shipped to HK than within the US.