“Why would a school pay $80 for a textbook that may quickly become irrelevant, when it could pay around $5 or less?” That is the question that Fortune editor Scott Olster addresses in his blog post entitled “Startups Are About to Blow Up the Textbook.” Open source materials, due to tight budgets these days, are becoming more attractive to schools and universities. Open-education publishers like CK-12 and Boundless are starting to come into the limelight and gain the trust of educational institutions. In addition to being cost-effective, open source materials offer more flexibility and allow for students to customize how they learn. For example, CK-12 breaks down “each individual facet of a given subject into small parts in its digital textbooks, known as – flexbooks.”