The first three installments of Stephen R. Lawhead's The Pendragon Cycle are on sale for a limited time. The first volume, Taliesin, can be downloaded for only 2.99$ here.
Here's the blurb:
It was a time of legend, when the last shadows of the mighty Roman conqueror faded from the captured Isle of Britain. While across a vast sea, bloody war shattered a peace that had flourished for two thousand years in the doomed kingdom of Atlantis. Taliesin is the remarkable adventure of Charis, the Atlantean princess who escaped the terrible devastation of her homeland, and of the fabled seer and druid prince Taliesin, singer at the dawn of the age. It is the story of an incomparable love that joined two worlds amid the fires of chaos, and spawned the miracles of Merlin...and Arthur the king.