The first three books of the Princelings series are FREE from Smashwords from now until midnight, 31st July (Pacific Time).
The Princelings of the East is permafree on Smashwords, but this is a great opportunity to pick up the Princelings and the Pirates or the Princelings and the Lost City for nothing, too. This offer only applies to ebooks, but you can select the versions for kindle or for Nook, Kobo and iPad - or even as a pdf if you prefer. Just click on the book you want and follow the instructions on the buying link.
The Princelings of the East
The Princelings and the Pirates
The Princelings and the Lost City