Kindle eBook + Audible Is Cheaper than Audible

I just signed up for a 3 month free trial of Audible because Amazon gave a $10 credit for doing so.  

I noticed something while browsing the books on Audible.    It seems that if you buy a Kindle ebook and then add the Audible audio book the total cost is cheaper than buying the Audible audio book alone.

For example :

Game of Thrones : A Song of Ice and Fire, book 1 is $41.95 for the Audible book.    The Kindle ebook is $6.99.   You can get the Audible book for $12.99 if you buy the Kindle book first.   So the price for Kindle + Audible is $19.98.      Thats over 50% cheaper than just buying the Audible book.

Red Mars is $8.99 for the Kindle book.    You can get the Audible book for $3.99 after you buy the Kindle book.   Thats $12.98 total.    The price for the Audible book alone is $43.95.  

I looked at a few books and this seems to be the case generally.    I did see one book that was very cheap for the Audible at under $4 so that title was cheapest to just buy the Adible, but I expect it was a sale price.

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