Not necessarily. If the US, South Korea and others bought in, the price per unit drops substantially.
The vast majority of the price of these Iron Dome missiles is in the development costs
As a former manufacturing engineer making components for Patriot missiles I would know that. I also know that the economies of scale in such high frequency components and rapid response actuators are not there yet. There is no way can they get that unit to be economical against $1,000 rockets. A laser is the only tool that will make such a war of attrition unwinnable for the Palis.