The movement for open access publishing, sparked by libraries’ resistance to skyrocketing prices for scientific journals, is gaining ground rapidly, moving well beyond STM journals and winning adherents among university faculties as well as librarians. Publishers, long resistant to open access, are beginning to experiment with it. The critical question, and the major stumbling block to further expansion of OA publishing is, of course, how to pay for it. If users don’t pay for content, who does? Authors? Universities? Foundations? Advertisers? This session will explore a variety of business models for open access publishing, for both books and journals, from the perspectives of publishers, librarians, and faculty.