US Airways is running the Sale of miles till 31st of May 2013. Usually the miles sale for 3.5 cents/mile, but every month they run either a public or targeted miles purchase offer at discounted rates. They are offering the tiered bonus this month. If you buy 50k miles you would essentially get 100k miles (50k + 50k) at a cost of $1881. Check out the snap shot below!
I would recommend buying only if you are looking for specific redemption. US Airways allows holding the award for up to 3 days. So you can hold the award and than purchase the miles which usually are credited within a day. US Airways is Star Alliance member so you can search for awards either on Aeroplan or United but need to call in for reservation. Here is the link to the award chart and booking fees.
The purchase is processed through points.com so you would not earn any "bonus" miles if you use a credit card which bonuses Air Purchases.
Tip of the hat (OneMileAtaTime).
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