On the page for that bundle, if you want it, tap the "8 Item Bundle" and then the "Entire 23 Item Bundle" buttons, this guarantees you that you're getting the correct price for the bundle with them all, hit a higher-price button in the amount-section, if you want, use the Adjust Donation thingy to give more to charity, and then progress through Checkout.
I've not got it, yet, and it may not be in-budget, but I already know that the Complete Crochet Course is a good book, and there are a few others in the set that I've been wanting for awhile, too.
I hope that somebody else who wants to learn to do it can benefit from this.
I hit www.HumbleBundle.com/books every couple of weeks, to see what they're offering..
Awhile back they had one in the Software bundles that was full of Lonely Planet books, it also had some language-flashcards software, but .. why did they hide that away from the books section??
Anyways, for learners everywhere, there are some good ones in that set.
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Thanks! This is great.