They have become as much a part of the city streetscape as the homeless — drug dealers who sell hundreds of $10 bindles of cocaine, Fentanyl and heroin on Tenderloin and South of Market street corners while rolling in and out of jail. On the night of Nov. 29, for example, a suspect known as “Cena” was arrested at the corner of Turk and Larkin streets with 237 bindles of heroin, cocaine, methamphetamine and fentanyl.