Purchase details are here. Because Amazon is still not playing nicely with Hachette, there is no pre-order button on the Amazon website, which means the story is not at this time available for Kindle. I honestly don't know if that's going to change: I wish I did, I assume it is, but I cannot confirm. Also, I recommend against reading the summary, as it reveals some of the surprises the novella might otherwise contain for you.
I am so excited to finally tell this story. It's been lurking for a long time, and it's time the truth of what happened at Evergreen Elementary finally comes out. (This is a zombie story set in an elementary school. So, uh, yeah.)
When will you rise?