MrShawnB is very correct. California is one of the five states that do not allow personally grown mushrooms of ANY type, at all times. CA does not allow dried, fresh, or picked mushrooms to be growing near/around a personal area ever. It is "tied" for the most strict area in the world for mushrooms good and uh, bad.
You arent going to find any syringes on the net that will ship to California, believe me, I have tried. You are going to have to do like all the other potential shroom dealers and buy or pick some fresh Psilocybin Cubensis and make your own substrate with your own syringe. Id like to say Fuck the Cali gvmt for that one, too.
Anyway once you get the spores all set, Read, Study, and Follow this guide, it is the bible to all psilo growers:
http://www.erowid.org/plants/mushrooms/mushrooms_mmgg.shtml
Good luck. Growing shrooms aint like growing weed. Make sure you have a lot of time on your hands and tend them a lot. Read that bible like i said ^^ and pm me if you have any more questions. Cubensis for LIFE.