Villagers selling enchanted items no longer ask for emeralds with the enchantment. For example, I had one villager selling a Bane of Arthropods V book that used to take 1 book and 57 emeralds in 1.6, but with the snapshots 13w36a and onwards he sells for just 1 book, no emeralds needed. This happens with all enchanted items villagers sell.