Raintree Nursery is one of the best for dwarf trees.

Cummins Nursery
has very good trees

we have had good luck with dwarf fruit trees from Van Well Nursery in Wenatchee, Washington. A dwarf Cameo apple tree arrived with a tremendous root system & had several blossoms the first year (which we removed). The second year we let six apples develop & they were huge!

I've had great luck with Maple Valley Orchards. Most of their bareroot trees are on either Bud9 or M26. They might have some other dwarfing rootstock too. Good luck!

I just ordered with a friend from Maple Valley Orchards, I also like Trees of Antiquity. If you are local to SoCal my favorite if Jon's Fruit Trees in Somis.

type "garden watchdog" in google to get a list of well reviewed nurseries. I tried to attach the link but GW thinks it's spam (or more likely doesn't want you going to another forum that may have information beneficial to your question)...

John, as you're planning to buy 30 trees, you're entitled to a jumbo price break that you may have difficulty receiving from some of the nurseries. Cummins Nursery will treat you very fairly in this regard, and they send out first rate trees from a dandy selection of root stocks and scions. They're knowledgeable and will answer all your questions via email. Good luck. Misterbaby.

J. Vernon and Sons. I have not found a better deal. It seemed too good to be true, so I drove 4 hours to check them out. It's for real. But you have to call them to get a catalog. It might be too late for this year, they sell out every year.