Within your circles it may be hard. But if tasked to get some hard drugs today in a big city you could easily get it done. Find the tweakers who are very public in most cities and ask if they’d sell you drugs.
I have absolutely no idea where I'd find a "tweaker"(maybe that's a statement on where I live more than anything? and I would never have the courage to go up to them and ask to buy drugs. I imagine best case they'd laugh and ask if you're a cop, worst case they'd sell you god knows what or rob you. It's just completely incomparable to going to a store to buy a product.
