This is absolutely great. Very impressed by the team, website, idea. Its so amazing to see non-profits bringing transparency and reducing/removing marketing.
Something to think about: How does a funder know if the partner is not giving raised prices the operation. How well do you guys trust the partners and how close are your relationships?
[Edit] Found more info about the partners in their FAQ: https://watsi.org/faq#what-is-a-medical-partner. I guess the FAQ pretty much answer my questions.