It took me over 5 years to find ANY trace of heroin in Oklahoma. I mean I traveled all over the state following leads, hitting all the bigger cities like Tulsa, OKC, Lawton, Enid, Norman, etc. and never found any heroin when I was addicted to Oxycontin. I worked in a pharmacy and that led to me getting hooked on opiates, when I lost my job I had to find new sources and there were nights I was so desperate I would walk around downtown Oklahoma City and just randomly talk to homeless people and offer to buy them some H if they could find some for me. All I ever found were crack heads and meth addicts, I had pretty much given up and just realized Oklahoma is the capitol of methamphetamine and heroin just didn't exist here but then, with my luck as soon as I went to rehab and then got on Methadone maintenance I found a really good source for heroin, unfortunately I couldn't feel it because of the methadone but there were times I would skip my dose just to do heroin. I couldn't believe that I spent years and years looking everywhere for this drug and then it just falls in my lap after I get on methadone. Totally pissed me off.
The only other drug that I've had difficulty finding here is LSD, only been able to find the real thing a couple times throughout my drug using years.