i am new to the world of buying off ebay and am unclear about the process of buying from a non-US seller. I understand that you have to pay duties on merchandise bought from a seller outside of the U.S. how do these additional fees get calculated? is it included in the overall shipping costs from the seller (meaning that you pay an amount, including any applicable duties/taxes, to the seller at once)? or do you have to pay something to someone other than seller once you purchase? anyone that can educate me would greatly appreciated.