As of this date I have collected 23 books. I just ordered 10 books. There is a great site to order from, Kidsbooks.com The age for the books is 5-8 years old. We do not have to worry about duplicates as we are working with three schools. I just received an email from the site that they are offering 15% off on any order. As many of us will be order gifts this season online, please check out the site.