Entries in Airport Entry Fee (1)
Argentina Airport "Reciprocity Fee" @ EZE
Tuesday, January 19, 2010 at 10:09AM 
(Here's a heads up so you don't arrive in Buenos Aires surprised like Clark Griswold at Wally World)
For those reading this in the states and thinking about making the trip down to Buenos Aires I should let you know that as of January 1st the Argentine Government put into place a $131 US Dollar Entry Fee for all US Citizens at the Ezeiza International Airport (EZE) [best flight tracker].
The Argentine Interior Department had this to say... "The payment of this "reciprocity fee" IS NOT a Visa since Argentina does not require visa to nationals of the mentioned countries when traveling for tourism or business purposes". The Argentine Government set this entry fee on equal amounts to those Argentine citizens must pay when requesting a Visa to travel to those countries." - View Chart
The countries they are referring to are Australia, Canada and the USA. The fees for Australians and Canadians is U$D100 and U$D70, respectively. For Americans, it is a one-time fee that allows us to enter the country multiple times over the period of 10 years. I'm not sure what the final terms are for Australian and Canadian Citizens.
I just had a friend come down from the states recently and she confirmed that she had to pay the $131 US Dollar Fee going through customs.