Hey /wsr/, I'm a broke college student. Does anybody know any reliable websites which I can use to "find" my books, free of charge?

PS: Here's a picture of a koala, to help repay your kindness
I need:
--Business Law: Text and Cases - The First Course, (1st Edition) ISBN
9781285770185

--Fundamentals of Corporate Finance (3rd Edition)

--Fundamentals of Investing (12th edition)

Any help would be much appreciated!!