Just noticed that Humble Bundle currently have the Be A Coder repeated.
I picked up a similar bundle a few years back. The Haskell book is well worth it for the $1 tier.
So for $1 you get:
For $8 you get all the $1 books along with:
For $15 you get all the above long with:
And the final $18 tier you also get:
As with all HumbleBundle bundle purchases you can control how much goes to the site, the creators and to charity. The site is safe, I have many many purchases over the years. All have been fine, all steam keys I have got have been valid etc.
:)
Woz