Lobsters mentioned on the first floor are not for sale ... don't take it for granted. Lobsters cost hundreds or thousands of dollars each. Not everyone can afford it. There are crayfish in the supermarket. They are farmed in fresh water. They are different from lobsters in the sea.
If not, go to the vegetable market. Anyway, I have it in the vegetable market here. However, you must make it delicious. You mainly eat with flavor, without meat.