Replace Name Tag Trade on Master Librarians

Now that name tags are craftable, it is no longer fair to sell them for the price of 20 emeralds, especially from a master villager. There are a number of different options to choose from:

1. Reduce their price

2. Replace the trade with a guaranteed, biome-specific max enchanted book (like in the trade rebalance)

3. Replace it with an entirely different item

I personally think option 2 is the best one.