Humble Book Bundle: DIY Electronics 2.0 by Wiley

19 days
  USD1 (about AU$1.48) or greater
Exploring Arduino: Tools and Techniques for Engineering Wizardry
Learning Python with Raspberry Pi
Raspberry Pi Projects
BeagleBone For Dummies
Raspberry Pi For Dummies  3rd ed.

  USD8 (about AU$11.84) or greater
Circuitbuilding Do-It-Yourself For Dummies
Arduino For Dummies
Arduino Projects For Dummies
Raspberry Pi Projects For Dummies
Complete Electronics Self-Teaching Guide with Projects

  USD15 (about AU$22.20) or greater
Electronics For Dummies  3rd ed.
Adventures in Raspberry Pi  3rd ed.
Exploring BeagleBone: Tools and Techniques for Building with Embedded Linux
Exploring Raspberry Pi: Interfacing to the Real World with Embedded Linux
Arduino Sketches: Tools and Techniques for Programming Wizardry
Raspberry Pi User Guide  4th ed.