Forest Farm has it in their catalog. You might try calling Rarefind in Jackson. They always say they have a lot more than what is in the catalog.
http://www.rarefindnursery.com/plant_listing.htm
My guess is that you could find this one locally at one of the 'regular' nurseries but will be more expensive.

Here is a link that might be useful: Forest farm

or try fairweathergardens.com, down in south jersey. they specialize in larger sized specimens, and carry unusual cultivars.