I found audible.com a few months a go. It's owned by Amazon.com and sells all of the best sellers in audiobook format. It's one of my favourite websites.
You sign up for an ongoing subscription. It costs $7.49 for the first 3 months then the price increases to $14.99. It's worth it as you get one free credit included each month and with that credit you can purchase most audiobooks.
I've found that I save between $10 and $25 per audiobook I purchase. It's a great way to get through books quickly as I can listen to them as I go about my day.
I hope it helps you!
http://www.audible.com
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Reason:
DO NOT BAN USERS WITHOUT CHECKING FIRST. There is a difference between a spam bot and a user. I should do something about this to prevent future bans.