Improved large fruit/seed cultivars of Elaeagnus Species

Hello, I am making a food forest in my parent's backyard in Nantucket, Massachusetts (zone 7b) and am working with my neighbors to create their food forest and start a rare edible plants nursery. I have planted a myriad of fruit trees including lots of Peaches, Pears, Plums, Apricots, Apples, Pluots, Cherries, Paw Paws, Persimmons, Mulberries and some leaf crop trees too. I'm looking to get a hold of as many different large fruit or large edible seeded varieties of different species within the medium to high nitrogen fixing genus known as Elaeagnus. In this quest, I've found and procured a couple Elaeagnus x Ebbingei shrubs, Sweet Scarlet Goumi as well as the wild Goumi have some of the Large fruited Russian Olive from Afghanistan (Elaeagnus Angustifolia Var. Orientalis) that Baker Creek Seeds sells seed for occasionally (Here's the link if you're interested: http://www.rareseeds.com/bail-fruit/submit-review/) and some Trebizond Date seeds of the broad leaved large fruited shrub variety and the Narrow Leaved 40 ft tall tree variety from an ebay seller. Anybody know of any large fruited Elaeagnus cultivars that are out there? Or where to get them? My hopes is to propagate them and make them available to people as an edible nurse crop for their fruit trees. If anyone would like to trade plants or seed, I'm into that too.

Thanks friends!

Best Regards, Alden Lenhart

Arnold Arboretum located at Forest Hill, Boston has a Huge selection and most of them are pretty sweet (The birds get the best ones).
Are you actually able to get winter bloom and April harvest from your silverberry, While the plant does survives in my backyard I don't really get any fruit due to the cold.
I do have 2 goumi too.

Amazing, I want some elaeagnus x ebbingei as an edible wind barrier that will do in our poor soils in Florida.
I found a local wholesaler for it at plantant.com and registered as a landscaper which was free at the time a couple months ago.
I dont have any elaeagnus, but have seeds to swap (veggies from baker creek)

I had good luck getting the Elaeagnus Angustifolia Var. Orientalis Baker Creek sold to germinate. Maybe 70%. I unfortunately had less luck getting the small seedlings to prosper after germination. I have only one seedling that has crept along for 3 years now. I may be in it's "leap" season which would be nice. Baker Creek hasn't seemed to have any more for sale, a source would be a good thing to know about.
My sweet scarlet goumi finally survived a winter here in MN without massive dieback. Definitely a marginal zone 4/5 plant for me.
Good luck!