Seeing as that is a straightforward thing to do that is exactly what I have done!
Therefore you can now get my first two ebooks, What Ukulele Players Really Want To Know and More Of What Ukulele Players Really Want To Know in one single book for a better price than buying them separately.
The book is now on Amazon and Amazon UK (as well as the other Amazon stores) in Kindle format, and in other ebook formats on Smashwords.
And of course, the original books are still available if you prefer to get them separately. Expect iTunes, Nook and Kobo stores to follow shortly.