SOME will even slaugther the animal in front of you
What scenario do you have in mind?
buyer: "I'll have that pig!"
farmer: "Sure thing boss!"
pig: "SHREEEEEEEEEeeeeeeee..... gurgle gurgle.....gurg."
It takes a lot of time and effort to turn a live farm animal (even a chicken) into food. A pig takes several people most of the day and there's no way they're going to kill one in order to sell a kilo of schabowy to some out of town rando...
Yes, people with contacts to a person who's going to slaughter an animal anyway can 'order' or buy after the fact (or help with the tedious work in actually butchering and receive a portion that way) but as a piece of advice for a foreigner mentioning that is worse than useless.