US miles as low as 1.1cpm (DM Multiplier promo)
Aug 13 through Sept 12 you get 50% bonus miles on DMM purchases if you actually complete the trip. The lowest you can normally get is 1.6cpm, which gets to 1.1cpm with the bonus miles.
http://www.usairways.com/en-US/divid...ultiplier.html