Can I ask where you live? Not sure if you're in the US, but if you live on the east coast and are willing to travel to philly or baltimore then it will be easy. These cities have "open air drug markets," meaning you don't need a single drug connection to get hard drugs. I don't know how Baltimore works, but I'm from philly and it's about the easiest city in the country to buy heroin. If not, I know it can feel complicated, but learning to use the DN is definitely your best bet.
Edit: Also, Florida is a state that it is very easy to get "heroin" in. Specifically south Florida, around West Palm Beach and Miami. But their dope is terrible, which is why I put heroin in quotes, because I honestly have no idea what the fuck that stuff is... but lots of people OD down there so it should be fine for your purposes.