Have you ever been to the Chinese area of Buenos Aires?
It might sound anti-authentic but in fact it's a nice area where you can buy anything, litterally, from the food to the furniture including customer services (beauty shop, massage, etc). And the area is actually authentic, the little space dedicated to the place proves it!
In many shops and supermarkets you can find a whole maki-roll for only 35ARS ! You just have to cut it and it's ready to eat! Tested and approved by V&S team!
Located between 6000 Avenida del Libertador, Olazábal at 1600, Arribeños at 2200 and Juramento at 1600
Subway : Juramento