If you have a Kindle or the free Kindle App on some other mobile device, you may be interested in this ukulele eBook that is available today through Wednesday (Oct. 23). It is usually $3.99. The book is called 21 Songs in 6 Days: Learn to Play Ukulele the Easy Way. I have heard good things about the book, but I have not used it personally. I just downloaded it and will take a peek when I have a moment.
Fifth graders may be interested in the book since they will be using the ukulele in class later this year. Fourth graders may be interested in downloading the book since it is free and they will get to use the ukuleles next year.