There are loads of things to buy on this site, but as free/OER goes, A People's History for the Classroom offers 12 classroom-tested lessons and role plays for key chapters in Howard Zinn's classic text A People's History of the United States. This volume includes a new introductory essay on teaching strategies that align with A People's History of the United States, and collects exemplary teaching articles, lesson plans, and role plays from Rethinking Schools publications. (Free Download-PDF)

The Zinn Education Project promotes and supports the use of A People’s History of the United States in middle and high school classrooms across the country.