Generally, it is possible to buy it in local shopping malls, chemicals, cold drinks shops and hospitals.

Just to remind you, dry ice can be used, but it also has chemical components.

Solid carbon dioxide is called "dry ice". "Dry ice" is a better refrigerant than ice. Its cooling temperature is much lower than that of ice, and the low temperature of -78℃ can be produced by using "dry ice". Moreover, after melting, "dry ice" will not become liquid like ice, but directly evaporate into dry carbon dioxide gas with extremely low temperature, so its refrigeration effect is particularly good.