What is cheap and cost-effective to buy in Singapore?

I think these are the most cost-effective places to buy in Singapore:

1. Cigarettes: Buying cigarettes is more affordable in Singapore. For example, "555" cigarettes sell for 120 Hong Kong dollars a piece in Hong Kong, while they cost 100 yuan a piece in Singapore, a difference of 20%.

2. Cosmetics: For girls who like to wear makeup, buying cosmetics seems to be a good choice when traveling to Singapore for shopping.

3. Famous brand watches: Singapore has a wide range of world-famous watches, and the prices are much cheaper than in the mainland. For example, Omega, Longines and Vacheron Constantin are cheaper in Singapore than in Hong Kong, while Swatch is about 2% lower.

4. Pork jerky: Although pork jerky can also be bought in the mainland, it is also a specialty of Singapore. It is very thin, about two to three millimeters, and square in shape of 10cmx10cm.

5. Crocodile leather products: Since crocodile breeding and leather processing are all done in Singapore, the prices are cheap and attractive.