1.3 trillion before we even bought a plane. 120 million estimated per plane. All for a multi-role fighter that is supposedly needed for 'future' threats from Russia and China. It's mediocre at dogfighting, relying on stealth to protect it, and bears similar results for ground support or bombing.
The Air Force has even decided to not close down the A-10, a plane they despise and have been trying to kill for years, because the F35 is still not capable of handling the role of close ground support.
Think of all the good things we could have done with the money we are wasting to subsidize large weapon manufacturing companies' production of planes we simply do not need to face an existing threat.