I do have the complete set of 10 on hand as well as many other shohin bonsai items (books, DVDs, containers, tools). This isn't my primary income, but more of meeting of a need. The criteria I use is exactly as Al phrased it - yes, they're written in Japanese, but you'd have to be a "dunderhead" not to understand what's going on (at least with the books and DVDs). I've been doing shohin bonsai for some time now and if I wouldn't use it or want it, I'm not going to offer it to others.
I do apologize for not having the site to the point it should be, but feel free to drop me a note (dsp@miniature-bonsai.com). I would also recommend visiting
http://www.american-shohin.org - home of the recently created American Shohin Bonsai Association, a full-fledged 501c(3) non-profit dedicated to the education and enhancement of shohin bonsai in the US/Americas.
Kindest Regards to All and mea culpas to those who take offense to this somewhat commercial post.
-d