As it is now mid July most US based K-12 schools will be starting in a month. School supply lists and reading lists will be showing up soon as well. Before you parents, guardians,& teachers go to Amazon or Barnes & Nobel to find the books please stop at your local used bookshops. Used bookshops tend to have copies that are less expensive, and while they are in used condition, that does not mean that the book itself is worthless.
Buying from a used, independent shop helps everyone in may ways.
1: the buyer is paying less.
2: The book is being reused which is good for the enviroment
3: The student is learning how to help the economy and budget.
4: You are supporting small local businesses.
So please start your search with your local shops.