Here is the article. There is another one linked within this one.
Interesting concept, but I kept thinking this is an odd trade off. A Kindle for your Amazon Prime subscription. I’ve been a subscriber in various years when I needed more books. Then at the end, there was this sentence:
It’s a bit ironic, though, that you might have to be subscribed to a program that gives a price-break on shipping in order to get a free Kindle, given that Kindle e-books don’t need “shipping” at all in the traditional sense.