The Happy Ranch buffet costs RMB 60 per person. There are many people, so you need to go there early. You can go there at about 11 o'clock in the morning. You will have to queue up after 12 o'clock.
People start to get crowded after 6pm, so you need to make a reservation in advance or queue up.
Their main menu is hot pot, as well as some snacks and barbecue.
There are no other buffet-themed restaurants, but the Hwajinpo BBQ on the third floor is pretty good too.
Others include German Restaurant, Xiang Lai, Spicy Feast, Lao Ma Rice Noodles, Papa John's, Chengdu Snacks, Northeast Wind...but these are not buffets.