Regarding shipping into CA, I can tell you with assurance that yes, some nurseries do ship plants in soil to CA. (Whether it is legal or not is another matter.) I have received many potted-in-soil plants from several (non-CA) online nurseries, including those Shasta daisies that I was complaining about.
Funny that you should mention the 'PowWow White' Echinacea. While I was buying the roses and the 'Angel Daisy' this past week, I also picked up a single plant of the 'PowWow White' to try out in the Moon Garden.
I will take a look at Greenwood Nursery and see what they have wrt Shasta daisies. (I think that my last 'Ice Star' just died... sigh.) Thanks for the link and the info.
As for seeds... I have considered that. I bought some 'Silver Princess' seeds online, and I saved the last dead flower off my (probably dead) 'Ice Star'. (Alas, I did not think to save seeds from 'Darling Daisy' when I still had it.)