of billions
it won’t be cheap; $25 billion has been carved out in next year’s defense budget for the system, but the Congressional Budget Office has estimated the US could have to spend more than $500 billion – over the course of 20 years – to develop a viable Golden Dome.
The project will also present a bonanza for private contractors as the government won’t be able to build it alone, with companies including Elon Musk’s SpaceX in the running for highly lucrative contracts related to the system.
http://www.cnn.com/2025/05/19/politics/golden-dome-missile-shield-price-billions