We "placed" 3 trucks worth of concrete 3500PSI and #2 rebar on 2' center in my 1200sqft polebarn in October. For the labor and 'crete my contractor on charged $3250. I bought the rebar and sand and he provided the labor.
My neighbor two tracts over who is building a 3500 sqft concrete house (you know with the styro-foam forms that fit like puzzle-pieces) said he's used all 4 concrete companies around here. The best price was $92/yard and the highest was $130/yard. This guy is always great for "free information, no extra charge", but I learned that you have to take what he says with a grain of salt. Because it was after the lesson on concrete that he told me he was building a "concrete safe-room" inside a concrete house. WTF????