local wholesale market or get the goods online.
They are sold in shops in the vegetable market, and they are basically processed by other factories. If you want to wholesale, you should ask the shop owner.
Bula rice rolls is a delicious food, and its main ingredients are sticky rice noodles and shrimp. Rice rolls originated in Xiguan, Guangdong Province, a special snack of Han nationality, among which Bula sausage is the most famous.