College level textbooks tend to cost a great deal more than the paper they're printed on. And college students tend to have little money. That's an odd combination. With this project, I'd like to simplify the process of buying from others at your university who have taken the course and have the textbook.
This code is up and running at https://peromsik.com/bookmarket. Please feel free to test it there (especially login and email verification features) and break it in any way you can, and then create an issue here.
Please note that the project is in no way ready for public consumption. Don't eat it.
This project is made available for education and collaboration purposes only. Don't use any of this code in production. See the license.