There's "Taste of Europe" by Shadowlands at Quince Orchard Shopping Center in Gaithersburg. It seemed to have a lot of Eastern European foods when I stopped in there once.
Friends from Poland are visiting and would like to find a grocery to buy Polish foods.
I have this vague memory of a place somewhere on Rockville Pike (near Yekta?) that has eastern european foods…anyone know if that place still exists and if they have stuff from Poland?