For those who dont know Humble Bundle is a company that facilities donations for charity through the sale of digital media (typically)
Through partnership with different authors, game makers and others. They coordinate deeply discounted bundles with proceeds being split between humble, the authors, and the charities (you can adjust how much goes to who if you want)
Their bundle this time is a cosplay bundle, between books on sewing, wearable LEDs, gow to shape and cover foam for props and armor.
I bought the bundle a couple days ago cause I thought it was pretty neat.
There are about 19 days left to grab it if you want. About $605 worth of e-books for $20