Singapore is famous for relatively inexpensive hawker fare, and we enjoy our hawker center outings very much (often more than our restaurant outings!)
Two recent meals from the same Thai cuisine hawker store at the Pasir Panjang Food Center (which is next to the Pasir Panjang MRT station on the Circle line).
4 dishes plus rice for $21 SGD.
3 dishes (including a steamed fish) plus rice for $33. Steamed fish tend to cost significantly more than the other dishes.