Publishers are still on the way out, every day more and more authors, even big name ones are choosing to self publish or buy out their contract and self publish with online sources.
So as that happens, they will have the option to name their own suggested price, name the file types they want to use and the stores they want it sold at. If they choose to only use Amazon, then you take that up with the author, not expect or force Amazon to carry a different file type simply because you chose to buy a reader not compatible with the Amazon service.
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