$100 per yard is about the norm around me as well. Rough figure is double that if you hire it done start to finish. So probabally in the 12-13k range "turn-key"
If you do it yourself, you are going to need about 6 or 7 helpers. 67 yards is ALOT. And if this is in an existing building, the trucks usually only have about 20' of chutes. So you are going to be moving the concrete another 40' by hand. You also need wire or re-bar, grade-stakes and a transit to set elevation, rented tools like a power screed and power trowel. Then a saw to come back and cut it when done.
So you might save 3k or so to do it yourself, but that 3k is going to require ALOT of work and some GOOD friends to help.