Israel has deployed five Iron Dome batteries, but in March, a defense ministry official told CNN that Israel would need up to 13 batteries to cover all its borders. Israel plans to deploy a total of nine batteries by 2013, Israeli media reported.
The system is considered a game changer, Israeli officials said earlier this year.
"Eliminating the ability to hit strategic targets may lead Hamas to rethink the efficiency of acquiring the rockets it has used in the past," former Israeli ambassador to the United States Dore Gold said in March.
Prime Minister Benjamin Netanyahu said that same month: "The Iron Dome system has proven itself very well and we will, of course, see to its expansion in the months and years ahead."
Other countries have expressed interest buying the system, including the United States, South Korea and several NATO countries in Europe with military forces in Afghanistan, the Jerusalem Post reported in March.