According to Wiki, the F-35B runs a cool $101.3 million.
Wiki is wrong.
Go to SAF/FM documents and search for F-35B costs. . .
the “unit flyaway cost” of an F-35 for the Air Force’s version of the fighter, not including the engine, declined by $12.1 million to $57.4 million. The Air Force plans to purchase 1,763 jets, the most of the U.S.’s planned 2,456 aircraft. The Marine Corps version dropped to $72.1 million from $80 million, and the Navy model fell to $72.3 million from $79.5 million.