Now available on Amazon for a promotion price of $2.99...
Links:
Amazon US: http://www.amazon.com/Era-Of-Darkness-Volume-Extinction-ebook/dp/B01DKYAZCU
Amazon UK: http://www.amazon.co.uk/Ebooks-Era-Of-Darkness-Volume-Extinction-ebook/dp/B01DKYAZCU/
Era Of Darkness: Volume II: Extinction - Out On Amazon Now