Download a free copy of World Wide Rave. 
Download a free copy of A Way Through the Sea.
Download a free copy of Miss Brain’s Cool Math Games.
Please note that the price is currently $0.00, but that could change at any time. Be sure to check the price before checking out to verify that it is still free.
These ebooks are specifically for Kindles, but you can go here  to download a free application that enables you to read Kindle ebooks on your PC.