Rides a Dread Legion, by Raymond E. Feist, is currently 99 cents in the Kindle store and at Fictionwise, but should be free soon (maybe not today, but usually within a day or two of this type of release or at least after the official release date) in the Kindle store.
Book Description
The last remnants of an ancient advanced race, the Clan of the Seven Stars, are returning at long last to their lost homeworld, Midkemia-not as friends, but as would-be conquerors. Led by the conjurer Laromendis, they are fleeing the relentless demon hordes that are sweeping through their galaxy and destroying the elves' vast empire planet by planet. Only by escaping to Midkemia and brutally overtaking the war-weary world can the last remnants of a mighty civilization hope to survive . . . if the Dread Legion does not pursue them through the rift. The magician Pug, Midkemia's brave and constant defender, is all too familiar with the Demon King Maarg and his minions and their foul capacity for savagery and horror, and he recognizes the even graver threat that is following on the heels of the elven invasion. The onslaught to come will dwarf every dire catastrophe his imperiled world has previously withstood, and there is no magical champion in all of Midkemia powerful enough to prevent it. Only one path remains for Pug and Midkemia's clandestine protectors, the Conclave of Shadows: forging an alliance of formidable magical talents, from the demon-dealing warlock Amirantha, brother of Pug's hated foe, and the demon-taming cleric Sandreena, to the elven Queen Miranda, to the warrior Tomas. However, uniting enemies and bitter, vengeful former lovers will be no easy task, and even together they may ultimately be unable to turn the death tide. But a failure to do so will most certainly ensure Midkemia's doom.This special free edition includes an excerpt from Raymond E. Feist's newest Demonwar Saga novel, At the Gates of Darkness.
For those with a nook or mobile (sorry, ereader format only), check Fictionwise. I doubt they will drop all the way to free, but with the current MARCH2010 coupon for 10% off and a club membership, it'll only cost you 65 cents each and you'll get 29 cents back in micropay.