I used a forwarding service called Tenso (http://www.tenso.com/en/). They give you a Japanese address (which is the same for every order you make) to use when checking out, and when the address gets the order, they ship it out to you EMS. Of course there's a service and shipping fee, but you're free to order anything online in Japan. I've been using them for about two years, and they haven't failed me yet.

