I want to try this squash.
Me too.
It does not sound like they will be widely distributed.
see story.
http://seedkeeping.tumblr.com/post/103473484432/gete-okosomin-cool-old-squash-cucurbita
and
http://welrp.org/indigenous-seed-library
If you are looking for heirloom varieties you could look at:
(Check out their black carrots!)
Until some rule changes by the O admin this was a place where people would exchange old heirloom varieties. Now you have to buy them.