There is a tofu factory in Oakland called Hodo Soy. Their products are sold in select farmers markets, Whole Foods, as well as in the Ferry Building.
I attended a tour of the factory and it was amazing to see how they make high quality organic tofu the old fashioned way. When you join the tour, they give out samples too so you can try different soy products and enhance your food repertoire. A great thing to consider on a rainy day or have a fun date with friends.