I don't get it. Why is there no price for any edition of the books listed? Also, the two buttons (one shaped like a shopping cart, the second one shaped like a

I don't get it. Why is there no price for any edition of the books listed? Also, the two buttons (one shaped like a shopping cart, the second one shaped like a book) made me think that the first one is to add the book directly to a cart, and the second one to download a sample to my Kindle. But nope, the first one brings you to an actual Amazon page about the book, and the second one, even though it's located on read.amazon.com subdomain (the same one used for Kindle's Cloud Reader) has a different interface underneath it, not tied to your Kindle account. I've noticed that because Chromium is "not supported" while read.amazon.com is supported just fine when viewing it in Chromium. Hovering over these buttons gives me no indication of what those buttons were and I had to apply the "click and see what happens" tactic.