My friend has his master plumber license, but the only thing he does is ream out mainlines with his 1" diameter sewer auger. Him and his son were doing it for $150 last time I called him for my neighbor in October. It usually takes 1/2 hour, and he gives a 3 month guarantee. His wife is home answering the phone and scheduling 8 or 10 jobs a day. He doesn't usually have to go in the house, just runs the auger down the sewer vent in front of the house, back toward the house and then out toward the street, until the water in the basement starts draining out. Not a bad living.