Libraries
I'm sorry. I couldn't resist.
I actually thought about posting that bundle here. Aside from all of the books available at my local library, they give me access to several digital libraries (Hoopla, Overdrive, Cloud Library), and I can interlibrary loan most other books. Then all state residents can check out books from the university libraries. Being a student or staff at one of those institutions gives additional access to academic ebook collections (Springer, etc.) and journals. Most of the books I actually buy are picked up for $5 or less at my Half Price Books outlet. I've scored some good books at Goodwill stores as well (my stores are often in college towns so you find a lot of textbooks). And I especially like to hit up large scale used book sales, especially on the "bag it" days.
...
NASA has a
library of free books.
Project Gutenberg
https://www.gutenberg.org/Internet Archive
https://archive.org/details/texts
