Hi Robtillaart, I'm aware of Lulu so could be an option if Indiegogo doesn't work.
The 'first' book is aimed at easing people into the Arduino world but I think would also be useful for those with more experience (includes tables for connections/pin outs etc that I still use for reference). 'Volume One' was intentional as I'm already working on a more advanced volume two that a novice couldn't really pick up straight away.
Many thanks for the comments so far and please give me more feedback as I want to make this something that people really want to engage with.