[Sloth]

I paid $20,000 inc for 3 slabs recently:
1) 3x3m x 100mm garden shed F72 mesh no footings
2) 10x7.5m x 125mm carport with 300x300 footing surround F82mesh
3) 18x12m x 150mm machinery shed with 800 round piers 900mm deep F92 mesh and a roller door track.

I reckon you are getting touched boxhead. I would suggest leveling and metal dust prep yourself with bobcat from Coates (about $300/day) and then hiring formwork from coates and setting up yourself. It is not that hard.

Concrete around here works out at about $400 - $440 per cubic metre (poured) depending on the finish required.