A couple of wholesalers have had them - Devil Mountain and Sweet Lane. you'd just need to order through one of their retail accounts, if they currently have them in stock.

I dont know about your area, but some Asian type markets carry plants or may know where to get them. I got a nice grafted Michelia alba for $21 at an Asian Market in Jax FL. They had all kinds of cool plants. Have seen plants at other Asian food stores as well. That might not help you much in CA but just giving you another source idea to check on. Then there's always ebay lol.

Top Tropicals carries Michelia alba and the regular and Dwarf Ylang Ylang. You may have to sign up for email notifiction if they are out of stock. They are certified to ship to Calif on a lot of their plants now. They also sell a lot of tropical seeds.