barnesandnoble.com's Nook First section. The e-book is $4.99, available for immediate download. You can also get it in trade paperback ($12.99) and hardback ($26.89). I gotta tell you, Ms. B. read this thing and enjoyed it so much that, instead of grievous bodily harm, she hit me with mere vicious verbal abuse. That's some real testimony, that is.
Get it from Barnes & Noble here, or read more about the book and other ordering options at my website here. Do enjoy!