And to my surprise, French readers can order their paperback copies now! http://www.amazon.fr/dp/1501085735 They're still in English, but the shipping will be much cheaper here!
And CreateSpace also has a store where you can buy the paperback. https://www.createspace.com/4986899
And here are the UPDATED e-book preorder links!
Amazon -- http://www.amazon.com/dp/
Don't forget and don't wait - order today!
[6/7/15: Edited as we switch to Kindle Unlimited and being exclusive on Amazon.]