Things are generally the most authentic and reliable in origin. If you can find that there is a factory or an authorized factory in Zhengyang Building in Harbin in your nearby city, you can buy them from a regular supermarket. If the place of origin is Harbin and it is within the shelf life of the product, you can buy them in plastic. As for the price, I think 3 yuan should be a normal price in your place, because it is not cheap to sell in Harbin.