Brandon Muramatsu and David Wiley While critical discourses are proliferating in the open education community, there are a number of critically important issues related to OER that, as a field, we aren’t talking openly about. Perhaps the most important of these taboo topics is “sustainability”. Ideas like business models, funding lifecycles, ecosystems, markets, and revenue shouldn’t be anathema in our community. Real dollars and real time continue to be spent to make OER “free” (or low cost). While grant funding might be a great way to fund the startup of a project or program, continuing to live from grant to grant will not likely be a successful strategy over the long term, as funder priorities change and funding sources dry up.