Do you have a way to find leveled books? For example 3rd grade Reading level books?
Omaha Public Library does have separate sections for beginning readers and early readers, up to third grade. There are also some helpful lists by age and reading level--you will find many of them here: http://guides.omahalibrary.org/srp2015.
In addition--don't hesitate to ask the children's librarian at your local branch library! He or she will be delighted to offer suggestions.
I hope this helps!
Martha /Main Library