HIV treatment with ART is costly. A 2015 study using 2012 health care expenditure data estimated that the discounted lifetime medical costs for an individual who acquires HIV at age 35 years is $326,500 ($597,300, undiscounted), with 60% of the costs attributable to ART.
So that above excerpt is from the NIH website, I dunno how long the life expectancy is for their numbers though. Another website I found that lists drug prices (current), showed a list of maybe 100, with prices varying from $360/month up to $5000/month. I have no idea how many or which ones make up the HIV cocktail.