Humble Bundle have a bunch of pdf/epub/something else, DRM free Raspberry Pi books a bit of electronics and Arduino in a Bundle.
Mostly beginners but if not for you, why not gift someone that may want them.
https://www.humblebundle.com/books/diy- ... nics-books
Put all the money on a small local charity too (use the search under charity bit) who would really appreciate the $15
PAY $1 (ABOUT £0.72) OR MORE!
Complete Electronics Self-Teaching Guide with Projects
Exploring Arduino: Tools and Techniques for Engineering Wizardry
Learning Python with Raspberry Pi
Raspberry Pi Projects
BeagleBone For Dummies
PAY $8 (ABOUT £5.73) OR MORE TO ALSO UNLOCK!
Arduino For Dummies
Arduino Projects For Dummies
Arduino Sketches: Tools and Techniques for Programming Wizardry
Raspberry Pi Projects For Dummies
PAY $15 (ABOUT £10.75) OR MORE TO ALSO UNLOCK!
Electronics For Dummies
Adventures in Raspberry Pi
Exploring BeagleBone: Tools and Techniques for Building with Embedded Linux
Exploring Raspberry Pi: Interfacing to the Real World with Embedded Linux
Raspberry Pi User Guide