Generally, domestic restaurants use ready-made packaged ingredients and do not prepare them themselves. I bought this kind of material in a supermarket in Thailand. There were plenty of red curry and green curry. It was cheap and convenient.

If you want to do it, you can go to the imported food section of the supermarket to look for it. It is best to go to a supermarket that sells mainly imported goods, such as City super, Ole, etc. If not, you can go to Carrefour. Look in the imported food section of Walmart, but there may be few.