JA Konrath is offering some of his books for free on his website.
Check it out.
He is one of the few authors who have adopted this business of giving away free ebooks and dont see these free ebooks as a threat to his sales.
http://www.jakonrath.com/freebies.htm#ebooks
You may also download his printed novel Whiskey Sour for free from his website
http://www.jakonrath.com/index.htm