I would guess that the makers of Zmapp gave it to Brantly free of charge. The FDA can and does allow for compassionate use of unapproved drugs. Also, this drug is not a vaccine ( vaccines are given as a way to prevent illness prior to exposure and infection)
As far as charges for the quarantine room at Emory, the charges will be up to the hospital. Again I believe Samaritan’s Purse is paying for his care. They paid for his transportation back from Africa.
You are right, longfellowsmuse. Samaritans’s Purse is paying and other Christians are donating. For real Christians, as these people are, money is not their God...nor their top priority. Love of God and virtuous living and giving seem to be their top priorities.
Unlike many other Americans, they have their priorities VERY well ordered.