In CA you need a sport fishing license to collect a rubber boa, and keep in mind that the southern rubber boa is protected and cannot be collected. As I read the current regulations (I'm not a lawyer) with a fishing license you can collect and possess 2 northern rubber boas.
As far as I know, the only species native to CA that you can legally breed and sell (with special permit) are the Rosy Boa, Gopher, and Common Kingsnake. People do sell some CA native species that are from outside of CA (rosys, zonata agalma, etc), but typically they can be visually distinguished from the native CA populations... unfortunately rubber boas cannot. Also, I am not aware of any state where rubber boas are found where it is legal to commercially breed them.
If you do successfully breed charina in CA, I don't think you will find a way to legally sell the offspring.
www.dfg.ca.gov/licensing/pdffiles/fg1502.pdf
As AncientDNA said, you might contact Ryan Hoyer (he also runs rubberboas.com). He might have some thoughts for you. Personally, I would thoroughly look over all laws related to rubber boas in your state, and contact the department of F&G with any questions.
For your enjoyment, here's a rubber boa that I saw during my lunch break today, about 2 hours ago.