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If the house is that old the sewer line is probably clay tile and not cast iron due to the fact roots are getting in it. If his house is on a slab, then it will be a lot of work to properly tie into the exiting sewer line under the slab. Don't let them just tie in at the edge of the slab. PVC will end his root problems, so if he plans to live there for awhile then it would be in his best interest to do it right.

He might check Craigslist. There are several plumbing companies on there that may be cheaper and can do that job. The main thing is make sure they get the job permitted, inspected and provide a written warranty of their workmanship.