Teaching Tolerance is a great resource that is free for educators. The materials you can supply your classroom with are amazing. Dr. Taylor showed us this website in class and I can tell you is worth your time.
An online store for Carson-Dellosa Publishing. They have an assortment of books and other materials available for teachers and parents. Subject areas have materials listed by elementary and middle school grade level. A source for finding supplemental materials to use in class and help in teaching.