http://hollywoodlife.com/2015/10/04/cathriona-white-took-jim-carrey-pills-girlfriend-suicide-overdose/
"she had three prescription bottles next to her, all prescribed by the same doctor: Ambien (sleep aid), Percocet (a strong painkiller) and Propranolol (blood pressure/heart medication)."
I also read somewhere that a Zofran (anti-emetic) bottle was found next to her.
better suicide cocktails exist but props to her, she attempted in 2012 and failed. Her toxicology report hasn't yet been released though.
"Since Propranolol isn't a controlled substance (neither are
Chloroquine Phosphate and antiemetic tablets) you can legally
purchase them from online sources without a prescription if you reside
in the U.S."
Personally, I don't think ordering these drugs elsewhere would be an issue, other than packages possibly being seized by customs… 10grams+ of Propranolol would be lethal but I wouldn't trust it on it's own without a large amount of sleeping pills (500 mg valium) and a good anti emetic taken two days beforehand and before the ingestion of pills, maybe add in some alcohol for good measure. Oh and you'd want to crush the capsules up and put the powder in gelatin capsules, they taste like shit dissolved in water, apparently and I'm guessing they're slow release if not crushed.
Anyway, there are some threads about propranolol on narkive, the easiest way to find them is google 'propranolol narkive', searching for buzzwords on the website itself is annoying.
http://www.alldaychemist.com/ you can find anti-emetics, propranolol, some other blood pressure meds etc here. It's a legit website but don't rely on just blood pressure meds.