This is probably the best supermarket that exists, existed and will ever exist. It is a supermarket with a street market atmosphere that will not leave you indifferent because it is CHEAP and the cashiers are friendly and if you’re from Turkey they even speak your language. Of course they speak perfect German as well, so there is no excuse not to go and buy kilos of fruit and/or misterious Turkish Maggi soups.

Their webpage:

http://www.eurogida.de/de/home.htm

I would recommend the one in Neukölln, the cheapest I found until now.