Many countries are expensive in some places of the country and some areas are cheap. This is due to how close they are to a major city. In Singapore, it is similar to that. Their major cities have a high cost of living and so it is expensive. They are similar to other major cities around the world and especially in Asia.
However, their areas that are considered to be more rural are less expensive and fairly cheap because they are far away from the city. They live out in the country. Singapore is probably just as expensive as other developed countries. Therefore, if you want to live in Singapore, it would be suggested because there are probably places you can afford.