"Purchase any three $0.99 eBooks from the selection below and receive $3 toward your next purchase of select Kindle Exclusive books. How it works:
1. Purchase three titles at $0.99 from the selection below by 11:59 p.m. (PDT) on November 27, 2018.
2. You will receive an email when the $3 credit has been applied to your account.
3. Use your credit on an eligible purchase of select Kindle Exclusive Books by 11:59 p.m. (PDT) on November 30, 2018."
So, basically, you get three books
free. Plus, an extra 3 cents to boot.
There's not all that many titles (but make sure to click the arrows to see the entire selection!), and all of them are "Kindle Unlimiteds."
Find (other) terms and conditions at the URL below.
Click here.