An Aquiline Books author or editor may choose to give away their e-book files with the version of their book presented in the UNT Digital Library. Aside from that, the UNT Libraries do not currently have any e-book distribution channels available for titles published through Aquiline Books. You may make your own arrangements to sell e-books.
Publishers Weekly provides an overview of e-book distributors that authors can work with directly; others not mentioned in the article include Allen Press, Google Play, and Leafless. Note that these channels may prohibit their authors from selling through them while offering a free version of the book elswhere online, though some, like Amazon Kindle Direct Publishing, allow you to distribute for free in that case.