The first book from the Brothers Tuerl series can be found on Amazon for a limited time for $0.99
http://www.amazon.com/Brothers-Tuerl-Staffs-Zeus-ebook/dp/B00EAOVGP0/ref=sr_1_1?ie=UTF8&qid=1375782239&sr=8-1&keywords=the+brothers+tuerl
Or here on Kobo
http://www.nobooko.com/free-ebooks/?layout=grid&catID=39
http://www.amazon.com/Brothers-Tuerl-Staffs-Zeus-ebook/dp/B00EAOVGP0/ref=sr_1_1?ie=UTF8&qid=1375782239&sr=8-1&keywords=the+brothers+tuerl
Or here on Kobo
http://www.nobooko.com/free-ebooks/?layout=grid&catID=39