This is a commercial/charitable fundraising situation. The Humble Bundle folks and No Starch Press have bundled together a bunch of awesome books. Pay as little as $1 to get a few, $8 to get a bunch, and $15 to get them all. If you go in at the $15 level, you get ~$300 in books (all digital, all in multiple formats, all totally DRM-free, so you can read them however and wherever you like). It’s a really awesome deal (I bought plenty of Humble Bundles way before I ever was part of one—and, I’ll be straight with you: Being part of one as an author is a really big boon for me, too; my last Humble Bundle put an additional 30,000 copies of my book in front of eager makers, and helped me make enough money to stay afloat that year).
Even if you only drop a buck for the first five books, you’re getting some great stuff—Medieval LEGO is fun, the Scratch book is solid, and my son loved Lauren Ipsum (which is sort of a modern computer-science take on Phantom Tollbooth; he’s easily read it a half dozen times). Moving up to the $8 tier doesn’t just get you my book (which regularly sets you back ~$20), but also two of my favorite intro programming books (I learned Python from Teach Your Kids to Code, and Scratch Programming Playground is what taught my kid to code) and a really great manga book that’ll explain electricity to anyone. And, of course, going whole hog just piles on the awesomeness (again, I’m especially pleased to see a couple DIY hands-on electronics books here, especially since Arduino has gotten so dirt-cheap to get into). Every purchase doesn’t just benefit my publisher and me, but also Teach for America.