I don't know if it helps (and it's not a direct recommendation) but I recently had a 63 m2 (100mm) slab placed in my backyard and I paid for a) a bobcat to level the area, b) a concretor for half a day and c) 3 (or 4) mini mix trucks
I wasn't trying to save money - but the guy who coordinated all the work (I was building a bball court) arranged it this way and I'm sure it saved me a fair bit (I think the concrete was $2k and the bobcat/conctretor were $700 each).
Cheers
Jamie