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Do not purchase a Fire tablet for the purpose of obtaining KF8 (azw3) format! Those devices run a version of Kindle for Android for which there is no DRM removal solution available. It might be possible if you root the device but you would be blazing a new path with doing that.
I agree with tomsem that the most convenient method of obtaining Kindle books in KF8 format is to use "Download & transfer via USB" from Amazon's website, targeting an e-ink Kindle 3 or later model.
If you are worried that Amazon may curtail that function in the future my recommendation is to obtain a Kindle Paperwhite 5th generation, the original Paperwhite model. The latest firmware supported on that device is version 5.6.1.1, which was the last one before KFX support was added. With that device you have Download and transfer along with the ability to copy books from the device itself over USB. And being newer than the 3rd and 4th generation devices it will likely be supported for a long while yet.
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