You have probably already tried, but what about Ong's?
As far as having one shipped, you might want to call Mickey at PlantOGram (plantogram.com). He is a good guy, and has sourced things from FL for me in the past. One caution, with the phyto. cert. and shipping it will not be cheap. I have also heard good things about The Wild Papaya in FL. You might want to try them as well.
I will have to check my list, but I do not think that Pouteria sp. are on CA's prohibited list.
Richard