So, my new all-ages book:
Is now available in a printed edition for $6.95 You can get it here.
It's also still available for $2.99 for your Kindle and Nook.
My nieces heartily recommend buying either edition. They desperately want to read the further adventures of the Castle Sisters and want to be sure I don't have any excuses (For example: Nobody's buying them) for not writing them.
So, buy a copy. For the kids.