The ebook market is driven by a single-user purchase model, but publishers and aggregators are scrambling to grab market share in the public library sector. Further downstream are school library markets. In their fight for dominance, vendors are discovering the unique needs of these related but significantly different users. The result: a boundless number of purchase models from myriad aggregators and publishers. Lauri Vaughan, a high school librarian and vice president of the Bay Area Independent School Librarian Association, presents a summary of months of tracking the big and little players in the field.