The Rotary Club of Motorcycling Rotarians has access to, by actual count, a gazillion or so used books.  These books are available free of charge, and are written for grade school and middle school children.  If your club is interested in obtaining any of them, please contact PDG John Kramb at pdgjohn2015@gmail.com.  Your club will likely have to pay for the shipping from Chicago.  Books are free, shipping ain't.