For decades, science fiction writers and futurologists have predicted a time when wars are fought at the push of a button and Terminator-like robo-soldiers fight in place of humans. While the rise of drone warfare suggests that vision may be starting to come true, it would seem that it will not...
I think the B version costs about 200 million dollars, but it should come down.
Right now there are 24 F-35A flying, three export versions (serial number F-001, BK-1, and BK-2)