Interesting way to save $$ on purchases between Kindle and Audible

I wanted to purchase a book on Audible (I am not a fan of recurring subscriptions, I prefer to buy the content outright.)

Audiobook was $26 and change. I hopped over to Amazon, and bought the book on Kindle first, for $12, and refreshed Audible and the price had dropped from $26 to $8.

So instead of buying just the Audiobook for $26, I now own the Kindle version AND the Audiobook for a total of $20.

Yay!