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I'm wondering what's your use case. Why do you need your Kindle to play audiobooks, considering that your phone can probably do it, and if you absolutely want a separate device for playing audiobooks then it should be possible to buy a used mp3-player?
Even if you manage to jailbreak your device and install an audiobook player (it's called SOX) then your user experience won't be good because the UI is very minimalistic.
Did you already try the VoiceView feature?
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