Do you know the site crassulaceae.ch? They have a hard time keeping up with new cultivars, but they have authoritative information on the majority of species, hybrids and cultivars now in cultivation.
If your nursery is likely to have a interesting Graptopetalum hybrids and other interesting succulents, please keep my posted! Do you think they might ship? If not, maybe I can entice you with some of my succulent plants into a collaboration!