I bought it from Blade Connection in Kirkland, Washington. This is a really great knife shop with great people and an excellent selection. The store is called Epicurean Edge at the brick and mortar storefront as they have many high end it hen knives; you can google that name and select the blade connection tab for tactical or custom knives or just go straight to bladeconnection.
Michael, the owner, is a blade smith and does very nice culinary knives, many in conjunction with Japanese blade smiths. He has a strong connection with Kikui Matsuda and sells many of his knives. He received a number of his first folder prototypes of which mine is number five. He does have number one if you are feeling spendy.
He hadn't posted the folders online when I bought mine but he said very soon so you can check, the "new this month" link will have them when posted. You can call them as well, very helpful store.
Good luck, I love mine, it is high quality throughout - smooth action, solid lockup, nice ergos and that fantastic Kiku blade he is famous for. The blade almost effortlessly pushes through cardboard. My other fixed Matsuda blades are nearly indestructible and I expect this is an equivalent folder.
