Back in June 2016, Amazon introduced its “Prime Exclusive” phone program, which offers Prime subscribers attractive smartphones with budget pricing. The catch, however, is that you have to put up with lockscreen offers and ads to take advantage of the favorable pricing.
For example, the fourth generation Moto X has a suggested MSRP of $400,

Source: Hot Hardware – Amazon Prime Exclusive Phone Discount Program To Ditch Lockscreen Offers And Ads