What kyoma said...
I find myself farming and NPCing:
Slime Oils:
Drops ALOT in korroloka tunnel, pwn all the slimes for it, with TH subbed i sometimes get 2-3 drops from one single slime, i'd say about an hour to get 3-4 stacks, unless theres alot of people hunting them down.
Slime oils are your friend! Sneak oils are made with this, thats a money maker, however you should also farm...
Beehive chips:
Beeswax is needed for sneak oils, farm these like hell in konsctat highlands or gideus, its a matter of preference:
Gideus: Lots of yagudo to farm some cheap gil off of, also if you're looking for the norg fame quest, this is where you should farm ur bees, also theres the monster signa NM that pops every hour or so, lots of campers though, but still a good chance to get him if youre good.
KHighlands: Bees. Tons of bees... hit one with ur bare fists or a weak spell, also hit a sheep, a goblin and a sappling, run around like crazy and link all mobs you can find, kill em all with some AOE (im a blm :p so)
Goblins can drop animal glue, which is useful, they also drop cheap gil, doesnt hurt does it.
Sapplings drop seeds if you like to garden, they also usually sell good, sheep drop sheepskin, you can make sheep leather with lvl 4 leathercrafting, bring dark crystals and turn these into sheep leather for awesome profit, check the recipe for sheep leather on ffxi.somepage.com or something, and lastly, bees drop your beehive chips, get craftin.
Batwings:
O boy.. these rose in price alot lately atleast in ragnarok.. so overated it hurts, go in almost any low level inner dungeon, like KRT or the ruins in sarutabaruta, kill bats with THF subbed or ideally with TH2, these drop so often its silly, use batwings for hi-ethers that suddenly rose to 20k each in ragnarok D: ...
Dryad roots:
These are BITCHY, guess you can farm walking trees in jugner, theyre easy to kill, and you can also go Logging in some spots, i got 5 of these in an hour.. wasnt too good, but i did have to look for spawns of both walking trees and logging points, i guess a second trip would prove more fruitful, still dryad roots seem like a semi-rare drop, you need em for hi-ethers though.
Malboro vines:
Hi-potions and Hi-ethers
, 2 best-sellers, you need vines for them though, and they dont come in easily, best bet would be ordelle's caves, camp near stroper chyme, kill all mobs, kill em all because only 2 malboros pop in there, they almost allways drop 1-2 vines, ive once gotten 3 drops from both of the 'boros, totalling for 6 vines, theres more pops, if you know the dungeon well, you can make trips around and kill the malboros on the 2 spots they pop, i think 4 malboros pop in the cave, the spawns are sort of far appart thouhg, knowing ordelle caves, you know what i mean :p
Uh.. what else.. hm, i think thats it for easy recipes that you can profit off of, but you need to work ur ass off for them.