Prepare your happy for a very profit-laden high three-figure bill.
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.
You can get it in the UK, unsubsidised from a profit driven private company, for a mid-three figure amount.