We live in Tennessee and would like to plant as many fruit trees and nut bushes as we can find. I read that hazelnuts are a bush and produce fairly young. Persimmon and other natives top our list as well.

I have no idea how to wet up or run a co-op. Just a desire for 10+ of each variety I want. And no desire to buy from the big box stores.

I would think that at the quantity you're talking about, you might very well get a good deal from a local nursery without trying to do a co-op. It might actually be cheaper, if you didn't have to worry about paying for shipping. Just a thought.

I'm not sure what you're looking for, but we have had excellent luck (and paid decent prices) at Cold Stream Farms: http://www.coldstreamfarm.net/

I like Weeks Berry, Burnt Ridge Nursery for odd ball stuff, and Adams County for fruit trees. Great quality and best prices I have found.
Jeff