Where can I buy Nodules for knapping Gun Flints?

[stikshooter]

What happens when there isnt any more. Right now the entire firearms industry is out of just about everything.
I can make everything needed to operate it.
I can use the modern firearms for defense. Ammo is already darn hard to find.
I can use the flinter for hunting.

Use a bow quite/deadly and needs nothing I can't make and remake Bow/arrows /fletching and in a pinch iron points when I can't find flint/Ed