It is difficult to find appropriate books for older students who have not mastered the basic reading skills.  They still need exposure to print and participation in the reading/literacy process.  This site has many resources AND you can create your own book to personalize for specific needs.  Word of caution:  they are created by people just like you so there are errors and content that may not work for your needs - be sure to review the book before using it with students.   Best of all it's FREE.

http://tarheelreader.org/