Dragons of Autumn Twilight By Margaret Weis and Tracy Hickman. Book 1 of Dragonlance Chronicles. $1.99 at Amazon, Kobo and B&N. I've never read this series, but two of my siblings were big fans of this. If you buy from Amazon, you can add the Audible book for $3.49.
Amazon:
https://smile.amazon.com/Dragons-Aut...9728924&sr=8-1
Kobo:
https://www.kobo.com/us/en/ebook/dra...xv94R9DMH4z0JA
This next author I've never read and am including only because of a positive blurb from the late Mike Resnick. Hard scifi.
Primordial Threat - M A Rothman Book 1. $.99 Amazon, Kobo and B&N.
Amazon:
https://smile.amazon.com/Primordial-...9729171&sr=8-1
Kobo:
https://www.kobo.com/us/en/ebook/pri...AMxQ04WlXkjtEw