At last! Hopefully this is not old news but Amazon has added a "button" on the left side of a book's page listing in the Main Book Store that allows you to click on it to request the book's publisher issue it in Kindle format! The button is under the book's cover illustration.
Now we can ask a publisher to fill in those books in a series that have been omitted somehow from the Kindle format. Or those old favorites that we'd like to have available as a comfort book. No guarantees of course but this will give Amazon some ammunition to persuade the various publishers to "Kindalize" specific titles.
I suggest that we all get busy and search out our favorites in the regular pbook part of Amazon and then click on the button if it is not available in Kindle format. I did just that today for 30 minutes and clicked on all the Alexander Kent "Bolitho" series of maritime fiction.