Welcome to Permies Marco!
Given your location I will first recommend
Tikkun Farm .
They are in Mount Healthy, at 7945 Elizabeth Street, Cincinnati OH 45231.
While they have many programs, they explicitly practice
permaculture.
They have nursery and will have a plant sale soon, but they are very into gifting and trading resources.
The very best source of
permaculture plants I've found is
Funkes Greenhouse
Al Funke has an amazing collection of
medicinal plants, as well as his extensive offerings of peppers and tomatoes.
Growing Value is the nursery for the
Cincinnati Permaculture Institute
I myself am an avid gardener living in Price Hill, tending 5 plots scattered across the
city .
While terribly enthusiastic, I am also rather unreliable,but I do know
permaculture enthusiasts across Cincinnati.