another one for ya:

Buyu Books and Publishing
http://www.buyubooks.com/feature.cfm?f=13
Quote:

We specialize in rare and out-of-print books, videos, magazines and densho focusing on Japanese martial arts and related areas of interest such as history, philosophy, religion, and various other aspects of Japanese culture. Our mission is to provide the martial arts community with a link to the the foundations of Japanese martial arts.