I actually don't have many left, but will consider donating some.

BTW, I came across an old Life magazine article showing kids making and using the kind of viewer I created some time ago.

http://time.com/3737424/solar-eclipse/

I think I made my viewer about 20 years after the kids in the 1960 article. I am sure the world was in color at the time. Anyway, I recall that the stylish head-in-a-box viewer worked well. I could see sunspots with it and I didn't go blind.

-- Roger