I Want To Buy Land For Ag. Purposes In La County, Where Would I Find Listings Of Land-4-sale? Ag Regulations?

I’m looking to buy 10 acres (or more) of raw land in Southern California, near Los Angeles to keep livestock. I’m wondering how one finds already land zoned agriculture for sale? The area around my house is largely zoned for livestock already but the parcels are about an acre or so and being developed for housing with a horse. I’m looking to put a herd of goats on the property, but since they are goats, the land can be brushy and less than most would consider desirable. Commercial real estate sites don’t seem to handle – land only – listings or ag listings so I’m wondering who does? Any info appreciated.