David quoted half what others did, came early, and finished quickly to unclog the main sewage line responsible for clogging the kitchen sink after my failed attempts to plunger and manually run a snake through by hand. He gave me tips on how to keep the lines clear, slicing a lemon wedge in the garbage disposal with no water, then letting sit for at least a half hour to let the natural acids clean, avoiding using harsh chemicals, also to run enough water after finishing the dishes to help push any food particles down the pipes enough to push it out to the main under the street.
I finally have a plumber to keep in speed dial. You'll want him in your speed dial too. He really enjoys what he does.