If I were a man in my twenties or thirties, I could probably visit the neighborhood of any bridge near downtown, and especially one over the creek, and loiter a little. Someone would come out.
(I would expect that person to be both armed and suspicious. I would be very careful about how I looked and what I carried.)
I hear there are spots where you only have to drive up and lower your window, and someone will approach you. There are also certain 7-Elevens and other designated locations for transactions. I think a downtown park is also a distribution spot. News reports that tell you where arrests are made offer a clue.
My generation is gray-haired now (parenthetically, I think my generation has remained kids longer than any other), and so I’m guessing that there are a lot of gray-haired customers these days. But I also think that if I, as a decently attired, conventional-looking, non-tattooed older woman, approached one of those connection points alone and on foot, especially by night, I would be regarded as a potential victim and not a prospective customer.
If I were really, seriously after some drugs—not for recreation, but, let’s say, to help a dying relative who was in intractable pain—I would try to make contact through a young person. Drugs are so common that it wouldn’t be hard to find someone who knows someone. The hardest part would be getting them to trust me.
I have to add that I made a decision many years ago that if someone I loved were ever in that situation and couldn’t get relief by legal means, I would be willing to obtain heroin for him, any way I could.
And, not too cynically, if I had no other resource I might begin at an AA or NA meeting and look for someone who still looked very raw.