I may be in Japan in a few months. Are the flea markets a good source for locating Tenyo items?

I have been to a few flea markets in Tokyo and have never seen any Tenyo for sale but of course that means nothing. But I can tell you that Japanese culture in general supports older platforms of many types and it is not uncommon for people to have boxes of older stuff just like Tenyo. Whether they get sold at flea markets though I do not know. I've been visiting Japan regularly for the last 15 years but Richard would know much more about the Tenyo culture there.

People in Japan live in very small apartments and very small houses. They don't keep much (at least in my experience).