I don't remember seeing any prime button and I usually take a lot of time to make sure stuff is as it should be. Mostly because I don't want to use my gift card and to make sure any promo code already there is used. And for the kindle I tried several times as I was suppose to have the $5 code from the app camera product search thingie they gave out every 6 hours. But it wasn't there. So I don't think there was any prime button anywhere near the shopping cart or in the shopping cart. Pretty sure I would have seen that. Oh well. I did get the whopping $5 for buying a gift card and used that right on the washer and dryer. Not that it made any kind of dent there.