Just got to know Megabox and I must say that everything is slightly cheaper than, for example, the…read moresupermarkets Guanabara and Extra. Another advantage is that you'll find products that you normally only find in Zona Sul. The disadvantages are that the employees are just as slow as in other supermarkets (in average they scan one product per minute) and that you can't pay with international Visa or MasterCard. So, if you are not in a hurry and just prepare yourself by bringing cash, Megabox is the best supermarket to go in Zona Norte. Furthermore, its location at Avenida Brasil is quite convenient.