Even if it was legal at this point, I have never seen or heard of a fruiting size for sale in CA.
The 1 fruiting tree I have seen in CA mysteriously vanished from the university it was planted at.
In my mind that would have to be minimum 25 gallon and a few thousand .
But there are zero nurseries selling Wampee in CA.
Seed's are the only responsible route right now with the state wide citrus psyllid quarantine.