Shopping at Japanese stores online
Living in the U.S. for over 10 years, I sometimes miss Japanese products. Just like Americans, Japanese people shop a lot online nowadays, but not many stores offer international shipping.
There are two internet superstores that I use frequently. If you can't wait to get some cool Japanese products until your next trip to Japan, these URLs may come in handy.
Amazon.co.jp
Rakuten Market
Although Amazon does offer all different kinds of products, only books and DVDs are eligible for international shipping. They also note that some DVDs may not be able to ship overseas. So you really should count on Amazon only when it comes to books.
Rakuten, on the other hand, offers a variety of products for shipping overseas. This is basically a shopping mall containing many different small stores. If you buy something very very light (such as a ring, a necklace, etc.), the shipping fee might be as low as a few bucks.
Both sites have good English "FAQ" and "help" pages to guide you through the shopping process, but if you have any general questions about shopping online, post your questions on this thread!
Happy shopping 
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Comments
Tenso is good, I used it several times for some stuff from Rakuten.
Recently I prefer http://zenmarket.jp/en/ . It works as buying service but in most cases it is even cheaper than tenso. Also they help to look for stuff for free.