Further Edit: The numbers are for SPARC which is about a 1.65 meter radius. 3 meters is the smallest size for a power plant, so on the order of $1.2 billion f

Further Edit: The numbers are for SPARC which is about a 1.65 meter radius. 3 meters is the smallest size for a power plant, so on the order of $1.2 billion for the magnets assuming no significant decrease in material cost.