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https://theguardian.com/world/2024/apr/14/how-irans-attack-on-israel-was-stopped
Brig Gen Reem Aminoach, a former financial adviser to the IDF chief of staff, told Israel’s Ynet News that an Arrow missile typically costs $3.5m (£2.8m) a time, and David’s Sling interceptors $1m (£800,000). Adding up the cost of eliminating 100 ballistic missiles, plus the costs of the whole air defence campaign, is “an order of magnitude of 4 to 5 billion shekels (£850m to £1.1bn)”, he estimated.
However, the attack was also expensive for Iran, with ballistic missiles generally costing upwards of £80,000. The US estimates Tehran had about 3,000, the largest arsenal in the Middle East.