Here is the text of Atlas Shrugged; this one is not due until after The Fountainhad, so if you are planning on checking out both, start with the other.
I also have copies coming to school for you to check out. They are only available until the end of March. As with the other novel, I suggest you check out the topics first, do a little research, read prior essays (even though the topic changes each year, this will give you a sense of the skill of the writers) and then begin reading. This will give you a focus and allow the ideas to percolate as you read.