Zachary Zombie and the Wicked Worm is currently free on Smashwords, as are all of my other short stories including the newest ones. Just enter code SW100 at checkout. My novels are 25% off too.
Please use the Smashword's link in the first post if you're interested.
Also, I've added links to other stores now that they're available. Smashwords is the only store that's currently free though.