Answer: I know of only one source of Camellia sinensis; Raintree Nursery in Morton, WA. Here's their website address: http://www.raintreenursery.com/catalog/index.cfm
If you do a plant search under TEA, you'll find your plant. As I understand it, they do ship to California.
Best wishes with your new camellia!
Q&A Library Searching Tips