Around $7 billion....
He chose not to patent the vaccine because of how important it would be to keep costs down for people in developing countries.
90% of medicine produced is consumed by only 15% of people (the worlds richest).
I doubt someone would ever give out the vaccine for HIV, too many greedy people in the world. At the same time, I'm sure some bigger pharmaceutical company already has a patent and it waiting for the right time to create a vaccine to maximize profits.