large supermarket near asakusa/ueno

I'm looking for a large supermarket (like MaxValu in Osaka) near Asakusa/Ueno. I remember finding one on my last visit near Ueno station, but I cannot recall where it was exactly... I want to buy some cheap dashi, kombu, wakame, miso, matcha - this kind of stuff.

Not looking for 7/11, Lawson and so on.

Maruetsu (マルエツ）looks closest to the Ueno station. Check the map here. It is a super market you can buy what you want.

http://www.mapion.co.jp/m/35.710475_139.7858889_8/v=m5:%E3%83%9E%E3%83...

You're missing the obvious. Just go to Ameyoko. Stores there are cheaper than supermarkets generally. Check out the Niki Market and Ameyoko Center.