Still searching.
There's a guy on etsy (BellamyTrees) who sometimes does some hard-to-find cold hardy citrus; got an Ichang papedo, a morton, a keraji, a clem-yuz 2-2, and some others from him, but his inventory changes frequently w/o notice. I juuuust missed the dimicelli / dimicilli :/
I also managed to get some cold hardy stuff from georgiagrowncitrus.com and woodlanders.com