Tokyo Cheapo has been recommending OFX to its readers for several years as the best way to move money in and out of Japan. Don’t overpay on bank transfers with poor exchange rates, use OFX instead and get extremely good exchange rates on both small and large amounts.
They don’t just cover Japan though, OFX is one of the cheapest ways to exchange currency all over the world. It’s simple to use and secure. Create an account with OFX, transfer your local currency using your bank account, and they’ll transfer the foreign currency to your designated bank account (your own account or a third party).
It’s a really efficient way to move money, for example to send money back home, save big money on a property purchase, paying for holidays.