What is cheaper to buy in Singapore than in China?

I think it is cheaper to buy the following things in Singapore than in China:

1. Cigarettes: It is more favorable to buy cigarettes in Singapore.

2. Cosmetics: Buying in a large duty-free shop like DFS will give bulk shoppers a surprise discount, which is cheaper than buying in the mainland.

3. Brand-name watches: There are many styles of world-famous watches in Singapore, and the prices are much cheaper than those in the mainland. .

4. Crocodile leather products: Crocodile farming and leather processing are carried out in Singapore, so the price is cheap.