Sick system around 30 Billion $

Basically, S. Arabia will pay for equipments from US defence industry.
Israel objects and will mobilize congress-men to block the sale.
Israel will not block the deal, if US gives Israel money.

http://defensetech.org/2010/07/27/i...-tech-to-not-block-saudi-f-15-sale/#more-8405

S.Arabia wants not only new F-15 bit also 72 Blackhawks.
Deal approaches 30 Billion $ in value:
U.S. Saudi Sale Is Said to Approach $30 Billion Including 84 F-15 Fighters - Bloomberg

Conclusion:
S. Arabia pays.
Israel gets payed.
And if Israel does not get payed, it will block US defence industry getting paid.

Very sick system you have there

EDIT:
Sorry wrong forum.

 

Other nations pay for the products.
Israel will make "Monica Lewinsky" in the Congress and also get the products.