I send them e-mail, they told me how much should I send them including price, discount and shipping. I went to post office, bought International money order and sent it to them by regular mail, after they got it they sent to me knife - it take less then 2 weeks - 10 days or something... Some dealers here work slower.
They have several ZDP-189 knives, also but expensive.
Initially I found at A.G.Russel their High Speed knife, but even it is listed as high speed I figured out that model A.G.Russel has is actually 440C not high-speed-stainless as it was listed - see here at the bottom:
http://www.gsakai.co.jp/jp/english/shop/shop_gsaka6.html
so I canceled my order and contacted G-Sakai directly, by e-mail...
So now I have this knife which I love more and more. It has handle which is thiner in the middle which makes it exteremely grippy - it is like hold itself in my hand. It is pretty fast, I think it is pretty good fighter.
And this high carbon, high vanadium, high molibden and high tungsten steel make me appretiate it even more!
Thanks, Vassili.
BTW: Knife on your link is Kanetsune (not G-Sakai) Matagi Hunter