3rd Sub: BST
If your lvl 30 anything, then even a lvl 1 BST sub is enough to grab a Dhamel pet. These will do as almost as much dmg as a lvl 30 THF's dagger strikes. The Akabas aren't too shabby either.
Send the Dhamel after an easy mob, while you go kill something else.
Other mobs of interest.
Pygomies: They drop saru cotton. You can also steal saru cotton, so if you're THF, steal from them, alot. The mandies at Buru Pennisula drop more often for a lvl 30+ though.
If you are farming cotton from drops though, keep the 2-leaf, 4-leaf, and sulfur they drop. Since these are ex drops, you can only have one. And they drop far more often than cotton. If you keep them, you won't have to bother to keep throwing them away.
Once you get back to Windy, either trade those ex drops in for quests, or just stick them in your mog house and forget about them (recommened if you are going to farm for more cotton).
Saplings: Seeds
Crawlers: Not many of them, but they drop silk. But they don't drop calculus' or smooth stones either. Again, the ones at Buru drop more often for lvl 30+
Dhamels: Hides and bones. They eat up the inventory, but they sell fairly well. Again... Buru, 30+
Goblins everywhere. Gobbie gear, wild onions, coins. Umm... Buru... 30+
Yags everywhere. Necklaces, coins.
Ghosts: They spawn by the dino bones areas (there are 4) from 20:00~04:00, respawning in 1~2 game hours. They drop cotton cloth... very finicky drop.
Bones: Bone chips
Excavation: Since you're there, bring some pickaxes. 4 area in the zone spawn mining points (same areas spawn ghosts). You'll sometimes get little worms (loss) or bat fangs / bone chips (slight loss). Other times you'll get Giant Femurs / Chicken Bones / Scorpian parts (500~800 profit). The 'big' item is the Turtle Shell. Very Rare. But turtle shells will sell at AH for 2000, and very slowly at that. They sell straight to vendor for 1300, so I usually do that.
Excavation isn't really a 'main' form of income. It's just a nice addition since you're already there.
Warning: It's a newbie leveling zone, as well as a popular BST spot. Stay away from the little central area near the Buru zone, as this is a popular leveling camp. Just be polite. This isn't the highlands, plenty of Dhamels around.
And if you see a pet, assume it's a leveling BST, and go to a different square. If you kill all the mobs around a BST in mid-fight, you probably signed his death warrant.
Pre-emptive Karma Sniper Dodge:
Buru is almost exactly like Tahrongi. But in Buru, you should be around lvl 30 to be safe, lvl 35 to pwn everything... but is far more profitable.
The mobs drop more often (Same mobs, different level), and you can Log instead of Excavate.
You got Leeches instead of Saplings for Fiend / Beast Blood, and the all powerful Carby's Ruby. You also got Crabs for Crab Meat / Crab Shells. Bombs for Bomb Ash and Bomb arms. 2 NM's as opposed to Tahrongi's one. Both pushovers, both drops worth alittle more than Tahrongi's (but still worth crap).
Elementals: Thunder, Wind, Water. Compared to Tahrongi's Wind or Earth. Similar Elemental levels (i.e., you beat Tahrongi, you should be good for Buru).
Logging at Buru is far more profitable than Excavating... but requires more money up front (550 / hatchet at Mhura. 180 / Pickaxe at Windy) Then again, hatchets don't break as often as pickaxes.
So, Tahrongi is really only good for levels 15~30. After 30, far better areas open up.