The question is not in money. The question is in the working factory.
The ICBM/SLBM factory must run without a pause, It needs something to manufacture, something to let the personnel keep up their skills, the equipment be cared and kept always intact.
Money don't play much role here.
Because if tomorrow, say, "NK" builds a thousand of primitive rockets, no SpaceX can provide ICBM in a year.
The last ICBM cryorockets were Titan I and R-9.
So, whatever exists as peace time "contracts", the military needs will override any of them at any moment.