If you are willing to buy some daily consumer goods, there are various supermarkets for this purpose. International chain supermarkets like Metro, Carrefour, Wal-mart and Tesco have branches in Beijing.
Walmart Jianguo Road Branch: Basement One & Basement Two, Block B, Beijing Wanda Plaza, No. 93, Jianguo Rd, Chaoyang District
Walmart Zhichun Road Branch: Basement One, Ground Floor and First Floor, 4th Mansion, 48 A Zhichun Rd, Haidian District

Walmart Xuanwumen Branch: Basement One, Ground Floor, Top Real Garden Plaza, Xuanwai St. Xuanwu District
Walmart Sam’s Club: No. 158, Fushi Rd, Shijingshan District
Carrefour SJS LG Store: B1, No. 4 Building, Second No. 18, Shijingshan Rd, Shijingshan District
Carrefour Guangqu Men Store: 3F, Fuguiyuan Shopping Mall, Zone 3, Donghuashi, Nanli, Chongwen District
Carrefour Wang Jing Store: No. 16, North Guangshun Avenue, Chaoyang District
Carrefour Tiantongyuan Store: Longde Times Square, No. 186, Litang Rd, Changping District
Carrefour Tongzhou Store: No. 48, East Jiukeshu Rd, Tongzhou District
Tesco Dachengdong Store: No. 12, Baiziwan Rd, 1F-3F, Dacheng International Center, Chaoyang District
Tesco Happy Valley Store: Jin Chan Happy Valley