Per the email I received last night, US Airways is running a five day flash sale on purchased miles. Through December 20,  purchases between 30,000-50,000 Dividend miles will receive a 100% bonus.

This deal has been run numerous times in the past, and is now downright ordinary. US Airways promoted the same 100% bonus to targeted customers back in November.

Two Star Alliance carriers are selling miles at a discount this month.

US Airways will sell you up to 100k Dividend Miles for $1,881.25 (1.88 cents each.)
TACA/Avianca will see you up to 150k LifeMiles for $2,250 (1.5 cents each.)

Is either your ticket to a deeply discounted vacation?

US Airways

US Airways constantly runs its 100% purchase miles bonus. Sometimes the bonus is targeted that month, and sometimes it is open to everyone like the current August bonus.

During the promotions, you can purchase up to 100k US Airways miles for 1.88 cents each.