Check out this site. https://www.humblebundle.com/books
I just bought a bundle of Maker books (13 of them) including really cool stuff like making rockets, making simple robots, getting started with Raspberry Pi, basic Arduinos projects and more. Money goes to support charities as well, such as http://makered.org/Humble Maker Book Bundle

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• Rebecca Vivian: Thanks for sharing this! Great find!