pinkfeet: I live in sacramento too. Dillons beach has some good driftwood and not as popular as other beaches so the pickings are bountiful. I got some good driftwood with some interesting termite patterns last year.
Also, If you go up to jackson or west point then I am sure you can find someone who wants a manzanita trimmed for free if you ever need more. The stuff grows like a weed on the side of the road!