Although the actual law in CA is a bit vague, unless you can find a legitimate dealer who is willing to send them to you, you are forced to depend on an out of state friend or you might consider purchasing offshore - though that brings up other hazards. Customs frowns upon syringes full of liquids being imported.
I have often wondered how that law works. If it is legal in my state and I never cross state lines then why would I worry about sending them to an illegal state? Can California demand that I be extradited for something that is illegal in their state but not in mine? There is no federal law against spores so there is no penalty for the use of the mail.