Review: Celestial Products are suppliers of many astronomy titles for children and teachers, among them The Thousand Yard Model by Guy Ottewell. They also carry posters, greeting cards, calendars, moon calendars of all sizes, (even one showing the moon phases for the entire century!) and a 16" beach ball of the universe.
The challenge we face as teachers is in developing means of bringing the vastness of the sky into a manageable frame of reference. For a child used to exploring in the back yard, the entire sky can be overwhelming. Fortunately, there are many hands-on investigations and literature-based extensions you can use to foster students understanding.