How does a smaller, fully online academic library offer a wide and deep collection of academic level e-books to its distance learners in a sustainable and affordable way? The State University of New York (SUNY) Empire State College Online Library, with a staff of four, has used demand-driven e-book acquisitions since September 2013. Despite widespread publisher price increases, this DDA program continues to deliver quality content to users. This presentation will explore the e-book demand-driven acquisition (DDA) model in the context of that implementation. This will include in-depth analysis of usage data and costs, as well as impacts on course development, budget and inter-library loan.