According to Baidu map, Shanghai Kaihong Food Wholesale Market, Shanghai Zhongshan Food Wholesale Market and Shanghai Hongzhou Food Market (Hongzhou Food Trading Market) can all wholesale moon cakes.
Kaihong Food Wholesale Market Address: No.3663 Hutai Road, Baoshan District, Shanghai.
Shanghai Zhongshan Non-staple Food Wholesale Market Address: No.950, Xu Mei Road, Xuhui District, Shanghai.
Shanghai Hongzhou Food Market (Hongzhou Food Trading Market) Address: No.3705 Baoan Road, Ma Lu Town, Jiading District, Shanghai.