Many items on Amazon come from third party sellers. The indication of a third party seller product is "Sold by" line near the "Add to Cart" button.
These third party sellers set up their own products amount and you might find discount rates on these products. Both the discount rate and the third party seller are mentioned in the above photo of a bag.
P.S. Even buying from a third party seller, Amazon handles your details on its own so you do not need to worry about your credit card’s details leakage.