Hello Dave,
I'm also a P26 owner in the San Francisco area and have seen decent sails come off the shelf from a place in Monterrey
http://thesailwarehouse.com
They're pretty good for stock production boats and have a pretty good description on their site about different grades of sails and features. You can either browse the stock they have on hand by boat type, or specify a sail you want made.
Good luck with the search.
John Bolich