I grew some in rootmaker trays, planted them in there in fall, doing great last time I dug a few to check. I think I like this method SO FAR. I did not have any success storing acorns from DCO's in fridge with peat moss to plant in spring, even when others did great so not trying that again. If doing from seed, I'd plant in fall in trays OR plant in field in the fall. Do not store them from my experience.
For the trees, I ordered some from oikos several years ago when they went on sale. did great. they were still, hmmmm, $2-3 a tree or something?!?! I think they were rootmaker tray trees though. So, same as I'm growing now. I'd suggest trying to grow them (or heck, I'll give you some if you stop by) or if you got some cash, just try and find some on sale.