You have had online shopping experience on foreign web sites? give me some tips

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You have had online shopping erience on foreign web sites? Which sites do you usually visit? What kinds of articles did you purchase on the website? recently,i found it much cheaper if i shop a monocular from amazon.com than purchase in my country.I don't know the procedure of shopping on amazon.com, especially the checkout. How can I get an shipping address and billing address in the u.s.?