Humble Bundle Arduino and Raspberry Pi book bundles from US$1, $8 or $15 (AU$1.30, $10.40 or $19.50)

For example, the US$1+ bundle contains:

Make: magazine, Volume 38: Everything you need to know about DIY consumer electronics
Make: Basic Arduino Projects
Making Things See: 3D vision with Kinect, Processing, Arduino, and MakerBot
Getting Started with the Internet of Things
Getting Started with Netduino
Make: Getting Started with Adafruit FLORA
Make: Getting Started with Adafruit Trinket

Seen in Lifehacker.

Mods feel free to move to forums if this doesn't qualify as a deal.