New START Treaty

Huh? I'm sorry but you have been tragically misinformed about nuclear weapons.

Actually, I have had formal courses in nuclear target analysis and tactical fire planning with nuclear weapons during the early eighties. Have also extensively studied nuclear deterrence during the Cold War and the development of nuclear weapons doctrines of both NATO and the Soviet Union.

I'm sorry that you seem to have succumb to hype and the superficial lure of Wikipedia for your info.

The majority of nuclear weapons costs are not so much in the acquisition of the weapons themselves but in the delivery systems and in the huge and unique infrastructure required to manufacture, store, secure and service them. There is no dual-use options for these facilities and the highly trained specialists that run them, the costs are recurring and cannot be reduced without reducing stockpiles OR compromising safety or security. I also strongly suggest that a warhead for a Trident missile is not a particulary cheap item so cherry picking a low tech bomb's cost out of a catalog proves absolutely nothing.