anybody who could recommend anything ?
the best collection of titles that i know of is here:
the books are sorted by age group, and then by broad topic. if you look on the left sidebar, you can choose which age you need. good luck!
my favorites are the books for primary age children on integrity:
Looks like I'm a bit late in commenting here, but I was searching for the same thing for my kids, when I decided to help fill the lack by creating books like these.
In case you are still needing some, you can find a few that i've started with at this link:
I'll be adding more soon.