Volumes 1 and 2 of the Mongolian trilogy by Neal Stephenson, Greg Bear, and others, are coming out today, at $2.99 for each volume. Volume 3 is $2.99 for preorder for 2/26, plus some other prequels at $.99 and $1.99 each. This started as an online serial and then was picked up by Amazon's 47North imprint.
See Conanfan's previous thread about this
from May, when the first one was $.99.
The Foreworld Saga
The epic Foreworld Saga that spans continents and centuries begins with the Mongoliad trilogy, set in 13th century Europe. This sweeping work of alternate history follows a small band of warriors and mystics as they raise their swords to save Europe from a bloodthirsty Mongol invasion. They embark on a perilous journey and uncover the history of hidden knowledge and conflict among powerful secret societies that had been shaping world events for millennia.