Not sure why you say MSF is "almost entirely tapped out"—from MSF's website "Please note that Doctors Without Borders' response to the Ebola outbreak in West Africa is fully funded." Nevertheless, they're a pretty excellent charity to donate to (c.f. http://www.givewell.org/international/charities/doctors-with... and note they spend over 85% of funds on programs [~12% on fundraising, and ~1% on management]).