Amazon offers David VanDyke and Ryan King's Plague Wars: Infection Day: The First Trilogy Kindle eBooks for free. (Barnes & Noble and iTunes, among others, charge the same.) That's a buck off list and the best deal we could find. (For further comparison, you'd pay at least $45 for these three books in paperback.) The trilogy includes the first three books of the 17-book Plague Wars series: Eden Plague, Reaper's Run, and Skull's Shadows.