There is a vast range of open educational resources to choose from if you know where to look and how to search. For most teachers however the main barrier to using OER is the difficulty in finding the right material and assessing its quality and appropriacy. Institutions are reluctant to fully embrace OER since there are few established policies and quality guidelines and inventing these from scratch is simply too time-consuming. The move from a structured world of published textbooks based on a national or regional curriculum to an unstructured ocean of free resources of uncertain quality and with little or no pre-packaging is simply too daunting for most academic leaders to face.
Via Alastair Creelman