Let’s start with CheMystery.
This is a fun graphic novel mystery book by C.A. Preece and Josh Reynolds. Two cousins experience an incident that would make a physicist cry, but that works in a chemistry book because they now have the ability to observe and change matter. So this is a superhero book, designed to teach chemistry. The story is great, the science is great, and the pedagogy is well suited for kids and adults that like graphic novels.
Preece is the chem teacher (high school) and Reynolds is the artist.
This is written for grades 7 through 10 (ages 8-12) but some younger kids will do fine with it.
This book is pretty new, but I think it is available.
Here are some books that are currently available cheap on Kindle, for anywhere from free to two bucks, that are either science or otherwise, I suspect, of interest to readers of this blog: