Gillian,
I just booked the exact same thing...US Air out of Philly for $164 each (all taxes included). You do the same trick as me by doing a flexible search on the US Airways website. Its amazing, if you do a specific search, the exact same ticket can be $100 more. $165 is a great deal...subtract all the taxes and you are looking at about $60 each way....you can't beat that!! Snag it now because even though rates could possibly be lower later, you'll be EXTREMELY limited on available flights.