Today and tomorrow this event is taking place in Argentina, with around 160 companies included for online shopping. Keep in mind that you need to use a credit card issued by an argentinian bank. Also the valid date of the "factura" is when you receive the product or service, and you have 10 days to return it.
http://www.cybermondayarg.com.ar/
http://www.cybermondayarg.com.ar/