Be aware, though, that often the reading levels of these materials is still beyond the independent reading levels of your students. Look for materials that actively engage the students. Vocabulary exercises on this site may be appropriate for some students. Learning Materials for the Resource Room Student Dictionary - these dictionaries have definitions that make sense to students. Students who had been unwilling to work independently on vocabulary or learning terms for other classes often change their attitude when it becomes possible to do the assignment.
Supplies are negotiable.
If you are not going to have a way to supply them, you will have to deal with students who do not have the materials to complete their work. Some teachers have been known to require a shoe as collateral. If possible, get copies of the texts they use in other classes, or other books on those topics. You can have the students apply study skills learned in your class to materials they may be held responsible for learning. If you want to discourage them from relying on you to provide the books when they could and should bring them themselves, you can stipulate that if they use your book, they must do your assignment.