I have been looking for this plant on-and-off for a while and had finally found one back in March at one of the San Diego Succulent Society’s sales in Balboa Park. Lowe’s or Home Depot usually has them but they are usually picked over, overwatered, and seem to have a fairly high chance of dying off..
I don’t 100% know how to effectively care for these succulents, but I do know that they are very sensitive to overwatering. I potted them in a mix of cactus/succulent soil and placed them in the full sun. The general idea is to make sure that the soil drains as fast as possible to reduce any possibility of moisture being retained. The rule of thumb that I use is to wait until the soil has been completely dry for a few days before watering and even then to only water very very lightly. It’s fairly warm here in the summer so I end up giving them a splash of water about once a week. I will probably reduce watering when it starts getting colder.
They have gotten a bit bigger and are in the process of budding (and not splitting or keeling over) so I will take that as a good sign.