Beginning January 9, 2009, Argentina will implement a reciprocal tourist fee. This fee will only be imposed on those foreigners whose country of residence charges Argentines a fee to enter their country. In the case of American tourists, that fee will be approximately $134 which is the same fee that Argentines are charged when they apply for a visa to visit the United States. There still won't be a "visa" requirement and the Argentine government simply considers it "fair" to charge American tourists the same way that the U.S. charges Argentines. The big question is whether this will cover tourist for a set amount of time, say five years. It looks like it will be that way. However, for expats living in Argentina we all want to make sure that we won't be charged each time we renew our tourist visa. As of now it doesn't look like we will.
This fee won't be reserved just for Americans, but also Australians, Canadians, and any other country that charges Argentines a fee to enter their country.