NoraB, I used to work at Lassen's in Santa Clarita when I was pregnant with my son! Have you checked the local WAPF chapter leaders to see if there are any people selling it off the farm for cheaper? I used to get raw goat milk from a lady in San Diego county (a bit of a hike for you) for 6 or 7 dollars a gallon. Not exactly legal, but small producers in out of the way places don't really attract the attention of gov. officials. I think there is also a place called Yerba Santa dairy north of you, up by Santa Barbara area, that sells raw goat milk for pet food. I realize long drives don't really help save money...
Anyway, you may have better luck trying to find goat milk, since people are less likely to have a cow in their backyard in S. Cal than a goat. Plus, since raw cow's milk is sold in stores there, there isn't much demand for cow's milk off a small farm.
Other option, just buy less milk, but buy the good stuff.