Maybe this is part of the problem, per google....
The cost to produce an Iranian ballistic missile ranges from approximately $250,000 for medium-range models like the Emad to over $8 million for the more advanced Khorramshahr. On average, most of Iran's primary ballistic missiles cost between $1 million and $2 million each to manufacture.
By comparison, the sophisticated air-defense interceptors used by the U.S. and Israel to shoot them down (such as Patriot or Arrow 3 missiles) can cost between $3 million and $12 million per shot, creating a significant cost-imposition advantage for Iran's barrage tactics