US Airways and Points.com Offer 100% Bonus On Purchased Miles
A purchase of miles between March 15 and April 15, 2012 yields a 50% bonus. Joining Points.com (and registering your Dividend Miles account) before April 15 adds an additional 50% bonus to the transaction.
Each member is limited to a 50,000-mile purchase. Miles cost $0.035 each. Purchased miles do not apply towards Dividend Miles Preferred status.