Surviving The Evacuation, Book's 1 & 2, and Zombies vs The Living Dead are now available in all formats from Smashwords.
This is an aggregator site via which I'll be publishing the books on Apple, Kobo, B&N etc. I'm not sure how long it will be before they are available in these stores, but I'll let you know.
The paperback for Book 2: Wasteland, is coming. Choosing the fonts is proving a lot more difficult than I first thought (for rather boring reasons due to the difference in appearence of a font on-screen and in print). I'm hoping it will be out by the end of the month.