California deliveries BEWARE: I've looked into this in-depth preparing for a future delivery at the factory.
CA will charge you sales tax on the purchase if you have it delivered in CA, even though you are an out of state resident, just like if you drove over from Nevada and bought a refrigerator in Fremont. The only way around this is if your home state credits that tax paid against the tax due when you register in your home state. My home state of Kansas does not. I recently had a friend purchase a car in CA and they ended up paying sales tax to both states.
The state bill that was attempted but did not pass last year attempted to allow out of state residents to pay no tax in CA, to allow "car delivery tourism." This is exactly what I wanted to do, fly out, spend money in CA on hotels, food, & entertainment, take delivery of the car at the factory and drive home. But the 9.5% tax rate if Fremont effectively kills this idea.