I did a search and it looks like this might not have been posted here yet.
According to the Argentinian consulate in Sydney:
ENTRY FEE FOR AUSTRALIAN CITIZENS - MULTIPLE ENTRIES
This Consulate General would like to inform that from next December 20th 2010 Australian citizens traveling on Australian Passports as a tourist or for business purposes, will be required to pay an entry fee to enter Argentina, as per the following information:
1 - For Australian citizens the entry fee (100 American Dollars) will be valid for multiple entries into Argentina for a period of one (1) year from the date of initial entry
According to the Argentinian consulate in Sydney:
ENTRY FEE FOR AUSTRALIAN CITIZENS - MULTIPLE ENTRIES
This Consulate General would like to inform that from next December 20th 2010 Australian citizens traveling on Australian Passports as a tourist or for business purposes, will be required to pay an entry fee to enter Argentina, as per the following information:
1 - For Australian citizens the entry fee (100 American Dollars) will be valid for multiple entries into Argentina for a period of one (1) year from the date of initial entry