You can also check with your local library or bookstore to see if they carry a copy of the audiobook.
This is the most common source. The is available exclusively on Audible in many regions. If you are a member, you can use your monthly credit, making the book effectively $10–$15 instead of the retail price. The Audible version includes high-bitrate audio and Whispersync compatibility.
If you’re someone who enjoys: