There is one, and we shall get on cracking it e.g. I came up with weapon poison.
Buy from Herb Shop in Druid Place = 182 Gpea.
Next, bank all / buy 1k of it for 182,000Gp
Sell to another player Market price 277 Gp or Max Price 282 Gp ea = Roughly 95-100k Profit
Keep em' coming