These numbers come from the latest GAO report (March 19) found
here.
Here's the quick summary (see table on page 9):
Original baseline March 2007 Cost: $196.6 billion for 2,852 aircraft >Average procurement unit cost:
$69 million
Year 2011 budget request: $273.3 billion for 2,443 aircraft > Average procurement unit cost:
$112 million
Finally, the GAO estimates (see "Highlights on first page of report) that the current estimated investment will be $323 billion to develop and procure 2,457 aircraft >
131 million per unit cost