Read About OERs
What are they
U.S. PIRG Education Fund and the Student PIRGs. 2014. Fixing the Broken Textbook Market. http://www.studentpirgs.org/reports/sp/fixing-broken-textbook-market
Bureau of Labor Statistics. 2014. Consumer Price Index Databases. http://www.bls.gov/cpi/data.htm
Things to Ponder
All OERs are not created equal - Evaluation is a must!
These sites include a variety of learning objects covering a wide range of disciplines.
Open Textbook Collections
Here are a few sites that offer free and/or low cost textbooks. Many are international in scope. Quality of resources do vary, so make sure you review the titles thoroughly.
In an effort not to reinvent the wheel (or in this case a research guide), here are two additional research guides that provide additional information and resources.