Get the Kindle version for $2.99 on Amazon.  Thanks to the thousands of you who have done this already!

Buy an author-signed copy of the paperback via Google Checkout for $14.99 plus shipping.
There are 3 ways to enjoy The Demon Queen and The Locksmith
1. Listen to the free audiobook.  You can listen via the web on Podiobooks, or you can download on iTunes.
2. Download the electronic copy for $2.99 on Amazon.
3. Buy a paperback.  Author-signed copies via Google Checkout will arrive with a surprise or two, and they net the most profit for the author.