They're available on Amazon, but you can't download Kindle books to anything but a Kindle device or Kindle app anymore - Amazon changed things just over a week ago. I'm not fond of buying ebooks that end up not being actual purchases, but there are a lot of books that are now prohibitive to acquire in hardcopy. The most recent ones I've had my nose rubbed in are the Papa Schimmelhorn stories by Reginald Bretnor - I used to have the two paperbacks that I was aware of, but I lost them somewhere over the years, and prices on one of them run up into the hundreds of dollars. They're probably available on some of the sketchy "library" sites running on Russian and other servers, but I've always been leery of using them. So, I may end up with Kindle books, anyway.
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wheels