Warden Message: Argentina Airport Entry Fee from the Buenos Aires US Embassy, and other web pages such as TripAdvisor: Airport Entry Fee for U.S. Citizens beginning Dec 20, 2009 and Argentine Post: Argentina to Charge Americans confirm that now visitors from the US (and Canada, and a few other countries) will be dinged on both arrival and departure.
This is a Reciprocity Fee - Argentina has now started to charge the same amount - US$131 per person - that the US charges for Argentinos to obtain a visa. Still, this is disconcerting - to be charged that much on arrival to visit a city. The charge is to be levied once per every 10 years per traveler.
And there is a Departure Tax also - seems like it is around US$29 now.
Add to this the more than 20% inflation Argentina has seen in the 2000s, the lure of visiting Argentina is getting dimmer and dimmer.