What is the most lucrative drug to sell that you've found on here? I guess what is the cheapest you can get it for on here and then sell it for on the street for a lot more and has a high demand. Certainly not opioids or prescription amphetamines like Adderall
Any drug is worth twice as much inside Australia than outside it.
Uncut D-Methamphetamine is the most expensive drug. Cut meth looks better than uncut, so you could buy uncut meth from the couple of British vendors who sell it, cut it yourself with MSM, and re-sell it to americans who are used to highly-cut meth.
Use that money to buy cocaine in the US, cut it, and sell it to Brits who are used to terrible coke.