Over the past two years, I've been working with my district to transition from the popular textbook towards Open Educational Resources, or OER. One of the leading benefits of OER options is that they are free and open to educators. That in itself is a reason to inquire. The information has been vetted for credibility and some of it is derived from some of the world's top colleges and universities.
Via Tom D'Amico (@TDOttawa) , Anne Whaits