Let's just say where i am from there is no textbook in higher education , the professors try to accumulate most of the textbooks / literature into a ppt and they share it or we print it , that's it.

Anything else , you download it or go look in the library , if i wanted for instance to buy textbooks for the subjects for the three years i spent in higher education , some of the books cost a month of rent ....

So most of the time it's piratebay/ libgen /t411 ...etc , long live p2p , without it a lot of us wouldn't have access to the most basic of data, and seriously thank god for those youtube lectures , greatly helped .