While you are correct that it will likely be expensive, it is important to note that Descovy is an existing PreP pill that Gilead makes. So the cost of the new shot is yet to be determined, but the company has been criticized for the cost of their current PreP medication option.
It is also important to note that anyone with insurance in the United States will pay nothing, as the Affordable Care Act requires insurance to cover all PreP medications at no cost to patients. The pricing will only affect those who have no insurance at all, which makes this criticism all the more important to help this new medication reach those who would be the worst affected if they were to contract HIV.
When I was about 12 and searching the local paper to learn local rent costs. I was looking with the plan that I would move out at 16 and take my sister with me so we could escape the abuse we were suffering from our mom.