You should be able to find it in supermarkets, but I suggest going to supermarkets owned by Japanese and Korean companies first, such as the supermarket in Japan's "Huatang" shopping mall, where I bought it ~

The most convenient thing is to buy it online. Taobao has it. There are many stores that specialize in it. You can also buy a lot of raw materials for sushi. It is very convenient to choose a store with high credit and consumer protection to buy it without worrying about quality problems. Besides, it is very convenient to communicate with the owner to inquire about the situation and modify the postage before ~

All of the above are personal experiences ~