Some internship/volunteer program may require internship/voluntary work fee which is around $25/week. This is not included in the program fee. If the program requires work fee you will been informed well in advance during application process.
Basically all travelers headed to Tanzania are required to get a visa either in advance, or upon arrival. It is very easy on arrival, so we strongly recommend this. Cost is $50 for most nationalities, but $100 for U.S. citizens. Our staff will meet you upon arrival at the airport as you exit customs.