https://www.cnet.com/news/black-friday-2018-ebook-sale-dozens-of-kindle-titles-starting-at-2/

Seveneves by Neal Stephenson ($3): The moon explodes on page 1 -- and then the clock begins ticking on humanity's time on earth. Like many Stephenson books, this one is rich with scientific detail and has a problematic third act, but there's still a lot of enjoy and ponder over here.

Digital Fortress by Dan Brown ($3): Yes, this techno-thriller from the author of The Da Vinci Code is pretty ridiculous. But with his standard 5-page cliffhanger chapters and zippy plotting, it makes for an entertaining enough read.