You can't buy books via Kindle Android app, but there are a few solutions
How to Manage Your Amazon Kindle Devices and Content | PCMag
Here's Why Amazon Won't Let You Buy Books on Kindle App for Android Anymore - CNET
Why you can no longer buy e-books from Amazon on Kindle app - Wales Online
Goodbye Kindle book purchases in the Amazon app on Android
How to Create a Kindle Book Series Bundle on Amazon in Five Steps - OMM Guides
The Amazon Shopping App no longer supports buying Kindle Books - Good e-Reader
Amazon Kindle Scribe Review: Read and Write on this Pricey Ebook Reader | WIRED
How to Share Books on Kindle: 8 Steps (with Pictures) - wikiHow
How to Buy Kindle Books on iPhone & iPad (2023)
Amazon Kindle book purchases are the next Google Play billing casualty | Ars Technica
Return Kindle Books in 60 Seconds: How to return a borrowed Kindle book; including books purchased accidentally: step by step with clear screenshots (Jerry's Guide for Beginners) eBook : Splash, Jerry: Amazon.co.uk:
How to Buy & Read an Amazon Kindle Book - YouTube
How to Buy Kindle Books on iPhone & iPad (2023)
How to Buy Books on Kindle on Desktop or Mobile
Amazon Kindle: how to buy, download and lend books on a Kindle ereader | TechRadar
How to Buy Books on Kindle on Desktop or Mobile
How to Buy Kindle Books on the iPhone or iPad - YouTube
You don't own your Kindle books, Amazon reminds customer
How to Buy Books for Your Kindle: 7 Steps (with Pictures)
How to Put Free Ebooks on Your Amazon Kindle | PCMag
Loading the Kindle Library on an iPad - The New York Times
25 Best Kindle Unlimited Books to Read Right Now [2022] | Reader's Digest