Well, the book is still listed at just over half price on Amazon Kindle stores as they are price matching, but as the offer ended elsewhere, I expect Amazon to follow suit shortly.
Grab it while you can!
http://www.amazon.com/More-Ukulele-P...8448669&sr=8-4
http://www.amazon.co.uk/More-Ukulele...8448656&sr=8-1