X-link to the DRM-free thread for a new Humble Bundle with some educational kids/YA books at the higher level:
Humble Book Bundle Stranger Creatures supporting The Jane Goodall Institute presented by Brick Tower Press contains a mix of speculative fiction titles about imaginary creatures, and non-fiction books about real wildlife. The sfnal stuff (which includes a YA novel by popular author Bruce Coville) is at the lower levels, and the non-fiction at the higher tiers.
For $20, you also get 8 wildlife books about various animal species (apparently geared towards younger readers) presented by the Institute, as well as Jane Goodall's (
Wikipedia) own classic memoir
My Life With the Chimpanzees, in a newly revised edition. And for $25, you can sponsor a chimpanzee and get a plushie (shipping & handling not included), with all proceeds from the higher pledge level going straight to the charity.