No, Amazon should not be banned from offering free deliveries of discounted books, because it is fair to sell a product if people want to buy it. There is no reason to ban offering free deliveries, except to protect local booksellers. That is unfair, because Amazon can offer a good product at a low price, and this makes people happy.
I see no reason why Amazon should be banned from offering free delivery on it's discounted books. Furthermore, I see no reason why Amazon should be banned from offering free delivery on any of their items. Amazon has built a promising business to our country that not only offers great prices, but also pays it's employees fairly.