(edit) the moral cost cannot be measured:

"Our uniquely massive support for Israel has cost trillions of dollars and multitudes of lives. It has diminished our moral standing in the world, lessened our domestic freedoms, and exposed us to unnecessary and growing peril.

The majority of Americans – as well as our diplomatic and military experts – oppose this unique relationship. Yet, the lobby for Israel continues to foment policies that are disastrous for our nation and tragic for the region.

If we are to have Middle East policies that serve the national interest, that represent the highest values of our founders and our citizens, and that work to sustain a nation of honor, decency, security, and prosperity, then it is essential that all Americans become active and informed. Below are the facts:"

(the rest)
http://www.veteranstoday.com/2011/11/23/the-cost-of-israel-to-americans/