I am that poster, and I just came back from Japan with four of them, actually: 150 Petty, 180 Santoku, 210 Guyto and 270 Guyto. While rare, Hattori KDs ARE available in Japan, and I just sent the OP an e-mail telling him where to find a 210 Gyuto available for sale; I also know where they have a 150 Petty and a 180 Santoku available in Tokyo, so PM me if you are interested (to be fair, I will answer these PMs tomorrow, to give him a little lead time to contact the store first, which in one case is the same place as the gyuto).
However, beware that the prices in Japan are not negociable (though you will get some discount if paying cash), and these knives sell for the recommended price shown on Hattori's web site (see here), plus 5% tax. So they will be expensive, much more so than shown on Koki's web site (the 270 Gyuto, for example, sells for 226,800 JPY with tax, which is roughly 2,750 USD! Expect to pay 1,990 USD for the 210 Gyuto, and 1,850 USD for the Santoku).
I brought back other knives from Japan as well, but I will make a separate post with pictures soon...
Alberto,
I have a friend in Japan who will can go to the Knife Shop in Tokyo to get me the Hattori. How can i contact you to get the name of the store?