I found this government of Ontario webpage and thought it was a possible good source for seeds for a permaculture system. They have seeds of black locust (Robinia pseudoacacia), white oak (Quercus alba), black walnut (Juglans nigra), Honey locust (Gleditsia triacanthos), elderberry (Sambucus canadensis, Sambucus pubens), juneberry (Amelanchier spp.), dogwood (cornus spp.), hazelnut (Corylus americana), and many other trees.
Looks like the sample packets of 100 seeds for $5 could be just what the doctor ordered for most family-sized homesteads, and any form of ecological land banking that involves growing trees. Did I read that right?
A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
-Robert A. Heinlein
When I used to grow Bonsai I ordered seeds from mishobonsai(DOT)com a couple times. Fast and effective. I'm sure that many of the seeds he sells are not of varieties particularly useful for food production, but there is a lot to choose from.