It appears that the use of a debit or credit card will circumvent the $1,500 monthly cap.
MEXICO BANKING SYSTEM CAP ON EXCHANGE OF DOLLARS FOR PESOS
September 13, 2010
In order to regulate the quantity of dollars entering the Mexican banking system, beginning September 14, 2010, the Mexican government
will cap the amount of dollars foreigners can exchange for pesos in Banks & Money Exchange Establishments to no more than US$1,500 per month.
The measure WILL NOT AFFECT purchases made with credit cards or debit cards in Mexico.
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 all travelers bring Mexican pesos as well as their credit and/or debit cards to minimize any inconvenience the exchange cap at banks may cause.
Source ➥ Attention Travelers! Mexico has Changed the Exchange Rules for US Dollars*|*Mexico Premiere