A great post by our sister organization in San Francisco with recommendations for where to obtain grade-appropriate books in Mandarin.
Featured are grade-level readers produced by our own Brigham Young University and http://www.chinasprout.com – the official bookseller of my kids’ school.
I would also direct you to the online STARTALK summer reading camp, which features video and audio “read along” versions of Mandarin books, organized by grade level. Also available is an English translation for parents and online and printable activities.
I haven’t had a chance to test these on my kids. But the Salt Lake County Library has a collection of audio books (TumbleBooks) that you can access online for FREE. Some of the books are available in Chinese, Spanish and Russian. You need Flash capability to access them. But rumor has it, they’re starting to make some compatible with the iPad.
Directions: Go to http://www.slcolibrary.org/
Then go to KidZone followed by Reading Corner. Scroll to the bottom of the page, and in the right hand corner, you’ll see an orange box with the heading, Read Along. Click on that and it will take you to a menu where you can pick story books, non-fiction books, and read-alongs. There are also great 1 or 2 min. video clips about a variety of subjects. You’ll find the Chinese books under, “Language Learning.”