The space pen was made completely privately, with completely private investment, by a pen company that saw on opportunity. They privately built a pen that would work in space, gave it to NASA for clout, and then sold to the public. They spent a few millions on it, not billions.

The Soviets bought a hundred of them a few years after. Because "Just use a pencil stupid" is incredibly stupid in fact. Lose graphite particles or scraps are a terrible thing to have in your space craft in zero gravity. They cost about $30 each in today's dollars.