You see this is exactly what I mean. I want answers, not blind dismissal. I asked a question, and I have not gotten any answers. Where are the answers?
If you search the site for OTC, you'll see the same answer given repeatedly. It's not that anyone is withholding from you, because we all want easy options and folks are willing to share them if they available. It's just that OTC meds in the US are regulated to be OTC specifically so people can't easily or reliably die from them.
If you want fatal OTC options, you'll need to go to Mexico where they don't require prescriptions to regulate meds like meto, propanalol, and calcium channel blockers, the latter two of which are not 100% reliable for a fatal OD but have decent chances for success, especially when combined. Benzos, barbiturates, and medications like amitriptyline are, however, regulated in Mexico. I know this because I'm from the US and live in Mexico, and I have stockpiled all the meds I mentioned as unregulated, and tried to get the ones I listed as regulated. I have also gone to vet pharmacies and tried to obtain N, and it is not easy to access, and in fact can be unsafe to pursue.
That last paragraph is exactly the kind of information folks here would give you if what you were seeking were possible. I know it's frustrating to not be able to get what you want, but it's not the fault of the forum members. There's no special, behind-the-scenes easy ctb club. If there is, that's for rich folks on the deep web, not here. If there's something like that here, it's a scam. This is a free, public site for regular folks and poor folks. That doesn't, however, make it like a fast food drive-thru where one picks the cheapest, easiest, and most reliable options they can afford. If only it were that simple. The empathy for your frustration is free, though. Most of us here experience it as well.
I know that's not the response you desire, but I sincerely hope it helps.