According to the Israeli Defence Ministry their F35's will be around $100 million each, and since they will get them, more or less, free under a US Military Aid Programme I tend to give more weight to this than other sources, as they have no need of 'spin' to their public.
"The price tag for each plane, according to the ministry, is around $100 million. But there are experts, including Yiftah Shapir of Tel Aviv University's Institute for National Security Studies, who expect the cost to soar to around $150 million per plane, bringing the total cost of the 22 planes the IAF is seeking to obtain to over $3 billion"
http://www.haaretz.com/print-edition...ghter-1.308907