My concern was more with belladonna sap, I know it's not the most expensive, but there is never any on the auction house when I look. May be different on yours, but I would have to somehow get it from Morta. That's not something I could farm solo. As for meds, since skirmish drops philosopher stones like crazy, the price of Panacea has gone down enough to where people actually buy it, but not so low that you can't make a decent profit off it.