Buying access to librarian and Farmer villagers

I have lots of food and paper I need to exchange into emeralds. to do this I need villagers. Can anyone sell me access? I'd probably be willing to pay 20-50k for it. Also, Can't remember if they changed something about villager trades in 1.8 but if the person selling access can give me a trade refresher (can't remember if you can still ruin a god villager if you do something wrong) that would be great too.