By this morning, paperback versions of the Gray series should be for sale. Within a few days, Quake and Erupt paperbacks will be available, too. I went through CreateSpace only, so people and libraries can get them through Amazon.
I apologize to my Australian readers for the near-impossibility of getting indie paperbacks there. It isn't just me frustrating you, as you probably know. It's the system, and it's unlikely to change soon. (I wish Amazon would get KU to Australia, too!)
For future books, I'll release the paperback version a month or two after the e-book release. And I'll be working on starting on audiobooks in May, so that will be happening this year, as well.
Thanks for reading!