Most audio books that I wanted only available in the US. Here’s a few key factors to be able to buy any Audible audio books in any locations.

  1. Use US address with real post code. Virtual card and VPN are not needed
  2. Use Audible US marketplace (e.g. use audible.com, instead of audible.com.au)
  3. Always buy audio books using Audible credits, instead of buying them directly with your card, or adding multiple audio books to cart and check out at once

Another tool that is helpful is Matchmaker. With this tool, you can list your existing kindle books that has paired audio books for immersive reading.