The paperback version of the Book of Knowledge of Impractical Devices is now sold out, many thanks to everyone who purchased a copy!
The instruments that you can see on this website and in the videos are currently the only versions that exist. They are not for sale.
I am currently developing plans to make a small batch of the instruments for possible sale in the future. Please let me know if you would be interested in this, as it will help me approach it in the best way. Send me an email or say hello on Twitter.