We tore a large concrete slab out at our house as part of a renovation and went the rented jackhamers roiute. Depending on the thickness of the original pour, this can be a *brutal* job, and one for young people with good backs. We threw the used concrete directly into the bucket of our front end loader, and it was still a two day job. $4500. Seems like a very reasonable price for the size of the job on me, especially if it includes any kind of disposal.