Substitute Binder for Special Ed Teachers. Never feel unprepared for a substitute again with this dual-purpose, editable substitute binder for both short and long term subs. This sub tub binder is intended to provide you, the teacher, with everything you need to have well prepared day(s) planned for your substitute teacher. Have an organized, well put together substitute binder for your days out that is not only easy to put together and easy for subs to navigate. Learn more at Mrs. D’s Corner.