I don’t have a source off the top of my head but call around to some of the growers. Atkins or durling. They probably have nursery clients in NorCal and your tree could hitch a ride on an order.
It if you just want a reed, it’s not that hard for nurseries to find. Just ask them to oplace an order from their supplier. Supplier likely to be durling but could be la Verne or Atkins . I don’t now the others off the top of my head .evergreen nursery in San Diego is big and does wholesale, so they might ship.