Where to buy or trade Permaculture Seeds?

I'm a member of a number of seed trading groups on Facebook, but it's a lot of flowers and things I'm not that interested in. Not a lot of rare varieties of pomegranate and comfrey and haskap and goumi and elderberry and all the interesting things I want to grow.

Is there any good place for swapping or selling seeds and cuttings, especially those unusual ones that are more common in the permaculture world? Would there be an interest in a Permaculture-focused seed swapping group on Facebook? I've debated starting one.  Don't particularly want to if there's another good place for swapping.

This is popular
https://permies.com/f/19/resources

It's good to mention where you are located and where you are willing to ship too.  

if it would ever stop raining and dry up here I would be drying out patty pan/flying saucer, straight neck and crook neck squash, Roma tomato and bell pepper seeds. I'm afraid these overgrown mature vegetables might rot this year before I can save the seeds. I dont have dry indoor facility to do this. all it has ever taken is a few days to dry out in full sun on hot dry days.