Open educational resources provide a free digital alternative to traditional books. Boundless, a startup that’s two and a half years old, offers students an easier way to find and access these materials. Boundless has organized free digital resources aligned to popular textbooks in 21 common subjects. Students just have to look up the ISBN of their assigned book, and instead of paying $100-$200 they pay $19.99 to access equivalent material plus interactive study aids like flashcards and quizzes from their tablet, smartphone and laptop. Two million students use the platform each month, at the high school and college level.