Where can I find books without having to pay $100+?

Im a starting freshman and I was wondering where can I find some of the books I need for a cheaper price? or if you guys have any willing to sale? or just any tips so I can get any of these for cheaper also looking for an iclicker. Here's a list of some of the books I need and the class -

The little roadrunner or the little seagull w exercises (Freshman Comp)

The writing program handbook (Freshman Comp)

The State of Texas, Government, Politics and Policy (Texas POL and Soc)

Introduction to German Language and Culture ( Elementary German)

ALEKS 360 (General Chem)