I think some people may be under the mistaken impression that the Doctors Without Borders site only accepts donations of $35 or higher. That is not the case. There is a blank line below all the suggested donation amounts that allows you fill in whatever amount you feel you can afford. I've noticed that many charities do that: suggest some mid to higher amounts but leave you a line where you can fill in any amount that you want.
Anyway, I suggested DWB because I know they are trustworthy; I've researched enough about charitable organizations to be suspicious of many of them.
"I may not have gone where I intended to go, but I think I have ended up where I needed to be." ~ Douglas Adams
