The article, when talking about the disadvantages of MIT OpenCourseWare and other "big OER" projects, mentions that textbooks can cost a lot of money. This can

The article, when talking about the disadvantages of MIT OpenCourseWare and other "big OER" projects, mentions that textbooks can cost a lot of money. This can be true, but sometimes it isn't. A lot of courses are using older textbook editions. These can often be bought used for very low prices. I'm posting this so others using online resources will check to see whether getting the book is practical before dismissing it out of hand.