Pay what you want!
21st Century Robot
Make: Volume 44: Enter the Drone Zone
Make: Volume 37: Homegrown Drones
LEO the Maker Prince: Journeys in 3D Printing
Beat the Average
The Maker's Manual: A Practical Guide to the New Industrial Revolution
Make: 3D Printing: The Essential Guide to 3D Printers
Best of Make: Volume 2: 65 Projects and Skill Builders from the Pages of Make:
The Makerspace Workbench: Tools, Technologies, and Techniques for Making
Make: Volume 12: Invasion of the Blimp Bots
More books coming soon!
15USD / 21AUD
3D Printing Projects: Toys, Bots, Tools, and Vehicles to Print and Build Yourself
Getting Started with Drones: Build and Customize Your Own Quadcopter
Make: Planes Gliders and Paper Rockets
Design for 3D Printing: Scanning, Creating, Editing, Remixing, and Making in Three Dimensions
Oh phew, this gave me a scare, I was still deciding on the Origami Yoda bundle but it's still up :) - now to find a 3D printer!