Try Bob Fincham of Coenosium Gardens out of Washington State. He has a lot of Rare stuff as does Dennis Dodge of Bethlehem Nursery out on the East Coast. Both have websites. Other places: Arrowhead Alpines Stanley and Sons Wholesale Nursery (Only American Conifer Society Members may purchase) Gee Farms Rich's Foxwillow Pines Porterhowse Nursery others??? Dax
Apparently gets upright and conical with age. Porterhowse has a pic of one with cones, but doesn't state age.
Our 'Starker's Dwarf' started out prostrate, but as it matures, it is beginning to be more upright. The left hand image is a few years old; the right hand one was taken today.