Walmart, Carrefour, the real ones are hard to come by. The Leba in Carrefour is supposed to be made in Harbin. If you have time, go to the bakery and see if they have Leba. If not, ask them if they can make it to order

It's a good idea to talk to the bakery staff about this kind of thing. Even if they don't know how to make it, they can still provide you with useful clues

It means that the Leba in Chengdu is out of fashion. That means the Chengdu noodle bar has been eliminated, and it will take luck and patience to find it. Good luck, and good luck with the real thing.