Yeah, that happened for me with the D-777, which, whilst not absolutely Japan-exclusive, was rather hard to find in the UK. I had to travel to Tottenham Court Road, in London, where they almost always stock stuff that no one else does. Many times I've seen grey market stuff there, which means it's a damned-useful place for UK geeks in search of the latest-&-greatest electronic gizmos.
See if you can guess where I may be visiting, soon after the NW-ZX1 is released?
How about ebay?