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Amazon apply the fee regardless of delivery method. Check out the link posted by kennethcwilbur elsewhere in this thread.

https://kdp.amazon.com/self-publishing/help?topicId=A29FL26O...

Amazon charge $0.15/MB and the book was approximately 18MB in size.

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And that fee would be more reasonable if Amazon allowed authors to provide optimised versions of their book suitable for e-readers that don't have high resolution colour screens.

I don't particularly approve of their pricing, but to be fair the book could be downloaded many times over 3G in the future included in that initial delivery cost.

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