I've been a customer of Walter Andersen Nursery since I moved to San Diego in the early 80's.  The service has always been great and I've benefitted from their advice on many occasions.  My neighbor just bought some trees that are just not going to work in the application he has them in.  I said, "I know you didn't get them at Andersen's" and he couldn't figure out how I knew.  The price isn't cheaper when you have to do it twice!