It’s out there but not widely available. Vendors at farmers’ markets will have raw milk, yogurt, and cheese, including products made from goat milk. Sometimes producers will also travel around neighborhoods with stuff for sale or sell from their farm. It’s basically a matter of finding out who’s selling it from local expats or your neighbors.
We do not vaccinate our kids and it never occurred to me until a second ago that I do not know what the laws are in Costa Rica for children to enter schools. Do you know if it is law that school aged children must be vaccinated to attend a school or can they be unvaccinated?