> There’s no kiraana stores (i.e. small local stores) that sell grains and rice and vegetables here, it seems. (Or small stationery shops, or shops of any kind.) Almost all shopping has to be done at a big chain retail store like Lidl or Megamart or Target or any of the other big-names.

I wonder where in the D.C. area he is. Many areas around D.C. have an enormous variety of places to go grocery shopping, and there are grocery stores of varying sizes (from tiny to huge) from all sorts of countries - Chinese, Korean, Indian, Filipino, Ethiopian, Japanese, Polish, Russian, Iranian, etc. There's also an enormous number of farmers markets, as well as a decent number of boutique grocery stores (though those tend to be on the pricier side of things), independent grocery stores, delis, and seafood markets.