Having a Lotte (super)Mart within the vicinity we were staying was good: the supermart is located below the Lotte City Hotel Mapo (about 10-15 minutes walk from our AirBnB accommodation) where other cafes, restaurants and shops are located. Lotte Mart is akin to Singapore’s NTUC/Cold Storage with discounts and local products/produce ranging from food, to cookery to drinks and detergents/soaps. I haven’t been to the Lotte Mart at Seoul Station which is said to be a good place for gifts and souvenirs, particularly in the food and drink line, but this one was a good indication of what to expect in a larger store.