Your best bet to find our plants in California would be through
Monrovia Growers: http://www.monrovia.com/?s=ilex+verticillata.
Any garden center that is supplied by them should be able to get them in for
you: http://www.monrovia.com/find-a-garden-center/,
but you’d have to contact them directly for pricing. I’d advise you to edit
your question to remove your contact information to avoid the possibility of
unwanted contact from others on the internet. Thanks for your interest in our
plants!