Ok, I don't blame Amazon for this, but when there is a paperback version available for 10.04, and they want 11.99 for the Kindle version, it's time to just say NO. I will not buy any Kindle book as long as it is more expensive than other versions of the book.
I am on board with your boycott. I was going to buy "The Darknes that Comes Before" for my kindle but saw the price difference. It's actually 12.99 right now for the kindle version and 10.94 for the paperback. I now refuse the buy any copy of the book digital or pyhsical. Penguin Publishing needs to think about what they are doing. It really doesn't make any sense. They aren't paying to make a physical book and they don't have to ship it.