Humble Bunde known as offering gamers cheap game bundles for charity now accepting Bitcoin for purchasing The Humble Book Bundle.
You can purchase books;
and videos;
85% Off Essentials of Bitcoin and Blockchain Pre-Order
85% Off Getting Started with Python Bitcoin Programming
and Limited Time - FREE Magazines from Zinio! for only $1.
If you pay $8 you will unlock;
And if you pay $15 you will also unlock;
Introducing Ethereum and Solidity
You can choose where your money goes to; Publishers, Humble Tip and Global Giving's Hurricane Harvey, Irma, and Maria Relief Fund or even choose your own charity.
While it is pay what you want meaning you can pay $1 for tier 1 or giving away more than $15 for the relief fund, Bitcoin payment method requires to pay at least $2.50
As i write this, I asked Humble's comment on if they will accept Bitcoin on their store too, for now it is pure speculation and still waiting for an answer.
source: https://www.humblebundle.com/books/bitcoin-cryptocurrency-books