Effective September 14, 2010, the Mexican government will cap the amount of dollars foreigners can exchange for pesos in banks and currency exchange establishments to no more than 1500 USD per month.
The use of international credit cards is unaffected as transactions will continue to be processed in Mexican pesos, as per current practice.
The measure will not affect the amount of cash (in Mexican pesos) an international tourist can withdraw from an ATM machine on a daily or monthly basis.
It is recommended that travellers bring Mexican pesos and/or credit cards to avoid difficulties.
http://www.aircanadavacations.com/en/travel_information/travel_news/Mexico_Pesos
Ref: Air Canada vacations
