I can only wish you the best of luck in finding an online version. It might be challenging if you sought to find a copy of it without having to pay for it. I am sure that you could find an "ebooks" copy of it online, with some type of subscription cost being a part of the process. Outside of that, I think investigating options from local bookstores who would be willing to sell discounted prices of the book could be another option for you to pursue. One thing that I have thought about would be for students to examine the multiple webquests online that are devoted to the work. If you have access to technology for a classroom of students, having students survey and analyze the various webquests about the work and then giving them passages from the text which they could analyze and discuss might be another approach to being able to teach the work in a stellar manner without the copies of the work.
found it on this website