You probably already know this, but you will need someone in Japan to be a middle-man for you. No seller I have come across will ship overseas and I'm not entirely sure, but i think the only method of payment is bank transfer...
I was thinking of becoming a 'middle-man' myself actually. After I get all the GT parts I want for my car though. So far I have seen an auction for those TE27 mango lenses for only about A$25 which I though was pretty good and I could sell here for $$$$$$$$$$$$$$$$$$$$$$$$$$$$