I searched around for these, had no such luck.
The lowest sliding scale fee for homebirth or birth center in Bay Area was around 2500-3000 for the whole thing...I don't have that kind of money!
Medi-Cal does have some CNMs available as their provider. I did not like the CNM that I saw through Medi-Cal. At the end, I just chose a nearest random OB and a doula for my birth. Everything went pretty okay, I had "natural" birth, but I did have to argue with my OB on the phone for 30 minutes while I was in active labor!
You might be able to find a nice CNM through Medi-Cal. I didn't search deep and wide in CNM pool, because I got so tired to lack of options. You may get lucky.