Medium 3-figure at most. $400-600 for the full two-dose series.
Worth it.
I think my insurance covered it, even though I was 33. But yes, I would have happily paid $400-600.
Luckily, I can afford $999 to avoid experiencing Shingles.
Your average HN reader can absolutely afford paying a few hundred bucks to avoid getting a potentially life-changing disease, and should. I know multiple young adults who got messed up by shingles.