Since there's a new zombie show coming to town - Z Nation on SyFy - I'm letting eBook versions of CotD go for free for maybe the month of September or so, maybe longer, maybe not. For now, as in today and the short foreseeable future, you have to go to Smashwords to get a copy for nothing. The prices will update at all other eBook retailers over the course of the next week or so. I don't know how that works, but computers seem likely.
If you take a copy, come back and write a glowing review of it... (winky emoticon)