South Fourth Ring Road Bai Rong Mall. According to the information of Dianping. com, it is the cheapest to wholesale baby carriages in Bai Rong Mall on the South Fourth Ring Road in the Jingguang Expressway in Guanchenghui District, Zhengzhou City, Henan Province. Zhengzhou Bai Rong World Trade Mall is the nearest wholesale market to the main city, which mainly sells clothes, shoes, food, small commodities, department stores, toys, baby products, knitting, home textiles, wedding products and so on.