Most people seem to smelt Saronite and just vendor the stacks of bars for 25g/piece, that works out at 12.5g/stack of ore. On my server you're lucky to sell a stack of 20 for more than 13-14g. Titanium I usually sell in stacks of 5 for around 50g, eternals the same stacks of 5, price depending on which eternal and the current market price. Best way to keep track is get the addon Auctionner (WoW addon, not HB plugin or anything) and keep your scan data up-to-date.
As for herbs, I wouldn't have a clue as I don't have a herby, but I think Ice Thorn sells well as single items