^heroin is heroin, I've done both, I've had good white heroin and good black heroin, in general white heroin is usually cleaner. That being said no one can tell you where you can purchase heroin here, as that would be sourcing, but I've never failed at finding connections by just hanging out around the closest methadone clinic.
Also there definitely is white heroin, on the east coast that's all you'll find, 'white' heroin is usually just what people call east coast powdered heroin which can very in colors from white, beige, brown and grey. You can definitely tell the difference between powdered smack and fentanyl analogues, it looks, smells and breaks down very differently. white heroin is usually not found on the west coast, and if someone says they have it, it's usually very cut or very expensive, or very not real, and you're better off going with tar.
You do have to be careful if you don't know or have experience with ECP because when I was in the Bay area there was this 'china white' going around and it was killing people. a point of the shit was super expensive so I was reluctant to try it but when i did buy some I knew it was a pharmaceutical, and then when I did it I was sure it was probably a fentanyl analogue, super short fast life, crazy strong rush, no legs, and it wound up killing two of my friends, one they were able to save the other OD'd and died off a quarter of a point and was found dead face down in the dirt, a few other people I knew overdosed on it too. A friend of mine found out through one of the autopsys supposedly that it was methylsufentanyl.