• https://www.coursera.org/
• http://oyc.yale.edu/
• http://education-portal.com/
• crash courses by the Green bros: http://www.youtube.com/user/crashcourse/videos?flow=grid&view=1

lists compiled by others

• http://www.openculture.com/2012/10/introducing_a_list_of_50_free_university_courses_with_certificates.html

misc material

• http://www.hhmi.org/catalog/main?action=home

book rental

• http://www.collegebookrenter.com
• http://chegg.com