There are several retail parks and shopping centres in Saransk. There you find famous brands, like Zara, Ostin, Snow queen and other and you can have a good time in cafes. One of the famous retail park is "Ogarev Plaza". There are 5 floors. Three floors are for different small shops. The fourth floor is for cafes. You can taste different fast-food like pizza, hamburgers, pancakes and e.t.c. There are Fox cafe and club, here, where you can have a good time all night. There are some organizations, like cosmetic medicine office, tourism office and other on the fifth floor. "Ogarev Plaza" is located in the city centre near Millennium square.
There is other retail park in the city centre. "Rio" has 4 floors with shops, cafes and cinema. Here you can shopping with you family or friends, spend good time with your kids in a gambling hall where you find redemption games. And you can see a movie шт the cinema. Location on map: https://www.google.ru/maps/place/РИО,+торгово-развлекательный+центр
Another big shopping centre in the city centre is "Planeta". There is supermarket "Evrospar" on the first floor. It is all-day shop with good choice of food and drinks. There are different small shops with clothes on other floors. Location on map: https://www.google.ru/maps/place/Планета,+Торговый+Центр
A central department store is located on Proletarskaya street. It is old shopping centre with its own history. Here you can buy food, clothes, different souvenirs. Location on map: https://www.google.ru/maps/searchунивермаг+саранск
The photo of old department store:
Well, there are other shopping centers in other city boroughs. For example, "Max" is the big shopping center with many small shops. Location on map: https://www.google.ru/maps/search/макс+саранск
You also can buy products, clothes, souvenirs and other different things in small corners shops. There are several convenience store where you can buy food and articles of daily necessity all night.
Good shopping in Saransk!