Banks are not as plentiful as they are in New York and ATM’s are only located within the banks. In the residential sections like Palermo and Recoleta Banks are extremely hard to find and are limited to the major streets, so it is best to prepare for this factor before going out.
The Argentine government limits the transactions of foreigners, which generally never exceeds 2000 pesos for one transaction. These transactions can be costly because of your local bank so make sure to check your rates for withdrawal before you leave home. Also, you need to tell your bank that you will be abroad so they do not think your account has fraudulent activity and freeze it!
The ATM sections of the banks are open 24 hour a day, 7 days a week, but the banks themselves are only open during the week from 10 am to 3 pm.
Some students come with them as backup for their cash and credit cards. Do not rely on them as they are very hard to use in Buenos Aires and South America. The advantage is that if you lose them, or if they get stolen, you can put in a claim for your money.
Visa, Mastercard and American Express are accepted in most commercial stores and shopping malls. Smaller stores or kioscos do not usually accept cards.
Some restaurants or smaller shops may have a minimum that you must spend in order to pay with card. Make sure to ask if the place accepts credit or debit card before ordering an item or dining.