You could reactive all For Iowa Class Battleships and still have money left over for that price.
I hope the Zummwalt's won't be like the POS littoral Combat ships that have been thrust upon the Navy. Those ships are less useful than a PT boat, have a price tag of 1 billion, and shoddily built.
Just as a point of reference, the world’s largest yacht is under construction in Germany at an estimated cost of $600 million. (0.6 billion)