I managed to obtain a 2 emeralds trade for bookshelves on a cured villager, the default pricing is 3 emeralds but it seems to go down by messing with the demand/supply system. (I was just looping the trade to level him up, a while before I had bought the enchanted books)
2 emeralds for the bookshelf, 3 books, resell the books, get rich
Note that another cured villager is working near this villager.
Edit: redid in creative and the other villager wasn't needed
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Duplicate of MC-153334.
Its meant to be in game .That's one of the benefits of curing villagers ,you get awesome discounts. If you cure a villager twice he will probably sell you everything for 1 emerald and lets say instead of selling 4 pumpkin for 1 emerald you will only need to sell 1 pumpkin for 1 emerald .
my villager sells mending book for 1 emerald and you can buy 3 bookshelfs for 1 emerald and sell 1 book for 1 emerald. so basically infinite emerald . thats why villagers are game changers and very OP