I have used enotes.com in the past and that has worked pretty well. It is $49 a year and would have study guides, which include summaries, critical essays, quizzes, and essay assignments for most of the works. There is a portion of the guide that is free on their site.
This year I bit the bullet and bought the complete binder from Excellence in Literature. My dd loves to do things independently and I felt it would work well for her.