I live in Japan, and working for chemical company as a logistics.
I usually shipped some samples by DHL, or FEDEX.
Import is not my job, but I always ready all documents for export.
But, how large your quantity you want to import and export?
I think you want to treat some products by DHL, EMS or so.
I can research on some Japan web site. Amazon, Yahoo, etc. (using my account is OK)
Negative point: I can read and write, but speak is not well...