Just because it is illegal doesn't mean people don't do it. There are plenty of people in my area (very rural) who have sloppy spray-painted signs in their yard advertising that they sell whole butchered cows. (I'll take a photo in the future if managable) Most of my family live on the opposite side of the country in more suburban areas, but even they have to driven out to more rural towns nearby to purchase their meats from farmers directly.
Also in my area you will find many people who sell eggs, raw milk, hand made bread, raw honey, ect that they have farmed or made themselves. This is less common in other states though, I think. Especially the bread.
I've known some people (who live in the right part of the country) who would source a lot of these things from the Amish. I question how much they sell is actually theirs though. I haven't had much experience with them but what I have experienced has been questionable.
As for cheese specifically, I have only ever seen goat cheese on offer, and I had only seen it once.