COST OF LIVING OVERVIEW. Our cost of living indices are based on a US average of 100. An amount below 100 means South Carolina, South Carolina is cheaper than the US average. A cost of living index above 100 means South Carolina, South Carolina is more expensive.Overall, South Carolina, South Carolina cost of living is 92.70.ur cost of living indices are based on a US average of 100. An amount below 100 means South Carolina, South Carolina is cheaper than the US average.