Gobi's Sidequest

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Being a Manillo, Gobi is a keen merchant. In Prima, go to the big Market (the large building in the middle, with four stalls, one of which, the far right one, is empty). If Gobi walks behind the empty counter and presses A, someone will come up to him and either buy something out of your inventory or attempt to sell you something.

When you've lost Nina, before getting her back in Tunlan, open a market, and wait until someone sells you the Sleeper. This is Gobi's best weapon. The process is sped up a little if you put the entire contents of your inventory into storage beforehand, so that you'll only get sellers not buyers.

Any time after getting Nina back, do this again. This time you're waiting for Ox's Mallet, Bleu/Deis' GlowCN, or Nina's PowerRP (all the most powerful weapons of the respective characters).

Bear in mind that you do need to have enough money for these items. None of them cost more than about 20,000gp.