Criminal Justice books help

Hey, y’all, I’m starting up my semester next week. I’ve been killing myself trying to find some PDFs for these books. I’m paying for my tuition out of pocket, and these prices are killing me. Does anyone have a PDF for these books they can send me?  I’ve found older versions of each book but not the newer ones that my professors state are required for the class. Any help is greatly appreciated. 

Introduction to Criminology: Why Do They Do It? Fourth Edition

9781071859001

Introduction to Corrections Fourth Edition

9781071848999

Police in America Third Edition

9781071915448

Criminal Investigation Fifth Edition

9781544395661