"Intended to be the leading American advanced tactical fighter in the early part of the 21st century, the Raptor is the most expensive fighter to date. As of April 2005 the total development and production cost of the program is at least $70 billion, and the number of planes to be built has dropped to 438, and again to 381, down from the initial requirement of 750[1]. In April 2006, the Government Accountability Office estimated the cost to $361 million per aircraft. [2]. The main reason to the reduction of the aircraft can mainly be attributed to the fact that the F-35 Lightning II (formerly known as the Joint Strike Fighter) uses a lot of the technology used on the F-22, but at a much more affordable price."
thanks wikipedia