$99 drain clearing promo really was $99 even though job seemed more complicated than what I anticipated.
Tub was backing up, blockage was further down the line. Plumbers accessed outdoor cleanout, used roto machine to clear blockage. Machine "missed" a turn in pipe, going straight through to interior and breaking plastic pipe under inside sink opposite cleanout. Second attempt was successful in making the turn to reach and clear the clog. Plumbers explained what happened, quickly grabbed part from truck and replaced broken pipe under sink. Plumbers arrived within time window, kept house interior clean, knew their stuff, and we're quick & efficient.