Just wait around at night time for Zombie VillagersZombie Villagers. Then cure them. You need to find two to get a breeding pair.
So you need
- two splash potions of weaknesspotions of weakness
- 2 bottles
- water
- netherwart
- fermented spider eyefermented spider eye
- brown mushroom
- spider eye
- sugar
- gunpowder
- two golden applesgolden apples
- 2 regular apples plus 18 bars of gold
- patience to wait around at night long enough to find zombie villagers
Once you find a zombie villager, you will want to trap him in a cage and put a roof over him, so he doesn't die before he is done being cured. Once he is trapped hit him with the weakness potion, wait, and make sure that you hit me by the potion effect animation. Then feed him the golden apple. Then wait.
Since you have to be out at night you need a nice open area where monsters can spawn. You will probably also need some equipment to kill the mobs you aren't interested in. With a little luck you can usually corral a couple in 2-3 night cycles.