Available from many global retailers.
The US-centric links for ePub, PC’s, Kindles, Nooks, and iPads!
Lords of Dyscrasia US Kindle / B & N Nook / iBookstore / Walmart
Helen's Daimones, Amazon Kindle for $4.99 USD
Paperbacks available globally for ~$15.00 USD
Buy the kindle, and the Audible version becomes almost free!
Also try out the synchronizing Kindle and Audible with Whispersync-Voice-Ready