Re: Honeycrisp rootstock availability
Honeycrisp is a cultivar prized for it's fruit. I don't believe it is commonly used as a rootstock.
If you are looking for a rootstock on which to graft Honeycrisp, it can go on just about any apple rootstock. From what I understand, it isn not especially vigorous so you might not want to pair it with too size controlling of a rootstock.
You said you are starting a small orchard. Perhaps you might like to just buy a Honeycrisp tree already grafted. If you don't mind paying retail and shipping, there are a number of nurseries that will send you a bare root Honeycrisp tree.
Here in the Pacific Northwest I've been happy with One Green World, Raintree and Burnt Ridge. In the NE I'm sure there are a number of other good choices that will be less expensive to ship.
Honeycrisp is becoming popular enough that this year I have seen it at Costco and Lowes on who knows what rootstock.