>The cost of BCG is US$2–3 (£1.12–1.70) per dose (from https://pmc.ncbi.nlm.nih.gov/articles/PMC2083037/)

Even for poor countries it's not much. In the UK when I had it they sent a nurse round to the school and all the kids lined up and they did like one a minute. Free to us lot of course on the NHS.

I think it was quite nasty and leaves a scar though.