It is sold in supermarkets and grocery stores. In Chongqing, if you don’t want to see hot pot base ingredients, it’s a bit difficult. It's hard to say outside of town.
I recommend Qiaotou Pai, it’s delicious. The Qiuxia one is also good, but the salty taste is a bit strong.
The supermarket downstairs had a discount yesterday, and I bought 5 packs of Qiaotou brand hot pot base in one go. It was so cool~haha~it only cost 3.3 yuan per pack after the discount~