The Kindle sf novel "Prototype D" by Jason D. Morrow is free at Amazon (for how long, I have no idea) and has an accompanying $1.99 Audible WfV deal.
I'm not familiar with the book series or the author, but it's well-reviewed on both Amazon and Audible.
https://www.amazon.com/Prototype-Boo...=1&*entries*=0