Silver will make the NAB stem for your pipe for $350 I think.
I can see that and I don't think it's exaggerated. A hand cut stem is a lot of work to start with and such a unique type of stem must take a lot more time to make. And that is not taking into account wasted material if something goes wrong and she has to redo it.
I know that she had to redo at least two. I would love to have one, but not at that price.