Books for my students

I am currently a third grade teacher, but will follow this class to fourth grade. We have students with a variety of needs from ADHD, autism, learning disabilities, and some families struggle financially. With transitioning  between grades and  getting a new reading curriculum I need to get the books that will support our readers and work with the curriculum. This is important because it will help grow our readers. We have struggling readers that need to be exposed to these books in order to captivate them as readers and help them catch up to their fellow classmates.
I am trying to buy at least 2 shelves of books.