Great WS deals are getting as scarce as hens' teeth.
Unless the ebook is a Kindle Exclusive, the audio narration rarely is less than $7.49. Then, after having bought the ebook, well . . . . you end up not having a cheap WS deal anymore.
But here's one that is only _$3.98_! It's a "Christian Interest" book, _One Minute After You Die_, by Erwin Lutzer:
https://www.amazon.com/dp/B00TTCHT5O.