Hello. I tried posting this in another forum but it was not the correct one. I am hoping I am in the right place.

I started a class today and there is book that is required for the course. The issue, and why I am feeling a bit off about it, is that the author is the writer, and the publisher. The book is from their business and it’s only available on amazon in a paperback. Usually our books go through our bookstore through the college, so we could use financial aid. Its also over 30 dollars without shipping. I am just wondering if this is normal for professors to do or if its not. Thank you

Edit: Thank you all for answering. While I feel some were a bit harsh, I appreciate you all for clarifying. I would like to clarify a bit though. I am less concerned about the professor writing their own textbook, many of you pointed out valid reasons for doing so. The part and the main reason I asked is because it is sold on Amazon and not through my colleges bookstore.…