On average, concrete slabs can cost anywhere from $75 to $110/m2. Factors influencing this are
- Size of job/ area
- Thickness of slab
- Any finishes/ decorations on top
If your slab is going on a flat plot of land with no access issues, expect the price to be on the lower end of the scale. If it looks like the concreter will have to use a concrete pump to lay the cement, it will probably be on the higher side.