"Lifetime HIV-related medical care costs are approximately $210,555 in 2008 Canadian dollars (Pinkerton, 2010). Consequently, by preventing 5–6 HIV infections per year, the Insite SIF averts more than $1,000,000 in future HIV-related medical care costs. Andresen and Boyd (2010) estimate that the SIF generates $660,000 in additional cost savings by preventing 1.08 overdose deaths per year. The total savings due to averted HIV-related medical care costs and prevented overdose deaths (approximately $1.7 to $1.9 million per year), in and of itself, is just slightly greater than the estimated $1.5 million annual operating cost of the Insite SIF."

Source

Pinkerton, Steven D., "How many HIV infections are prevented by Vancouver Canada’s supervised injection facility?" International Journal of Drug Policy (London, United Kingdom: International Harm Reduction Association, March 11, 2011), p. 5.