NSTA Freebies for Science Teachers
"Freebies for Science Teachers is a list of books and other resources hosted by the National Science Teachers Association. You can search by keyword, filter by type, or just scroll through the recent additions.
Resource types include publications, CDs, DVDs, kits, and other. Resources are added weekly, so be sure to bookmark the site and check back periodically for new content." For more information please click here.