Hi Figlet!
That's probably a common theme for all of us. Here in the North East, we only find 3-4 varieties around. My impression is that the reason for this is that it makes sense for growers to rely on particular cultivars they know, and they feel people in general know, and talk about.
However when it comes getting figs that are rare, or even less known, I usually get them from sources I have gotten to know in this very forum. I have asked people for particular types, I have contacted sellers here who list on Ebay, and I have asked people here about reliable sellers.
Most of my Trees I have purchased myself from sellers such as Herman, Marius, ed, Giorgi and of course, I have traded with other fellas I have met here along my ways. Be patient, continue coming, reach our and communicate, and you will build up your own awesome collection.
PS: I believe that if you are in California, you must contact people within, as I believe things are a bit more complex in that state.
Regards!