score:6
Most of the coffee shops and restaurants in the largest cities of Argentina have free Internet access (password protected). You just have to order something and ask them for the Internet password.
Other than that you can bring an unlocked smartphone with you and buy here a pre-paid line with Internet access, then use your smartphone as a Wi-Fi hotspot to which you can connect your laptop.
I work many times "on the go" in coffee shops or other places in Buenos Aires, and I either use the available free wi-fi connection at the place, or use my smartphone as a Wi-Fi hotspot to connect my laptop through the smartphone data connection.