Im not sure if you can make more weapons and stuff. Like BG-57 said the restoratives and rare loot ones can duplicate.
EDIT: After some research, I found i neat Trick:
~~~~~~~~~~~~~~~~~~~~~~~~~
|Get two bazzar goods at the same time|
~~~~~~~~~~~~~~~~~~~~~~~~~
Example:
Sipping Wine - 2x Tyrant Hide
Monk's Garb - 2x Tyrant Hide, 4x Ice Magicite, 4x Coeurl Pelt
Case 1:
1) Sell 2x Tyrant Hide. Bazaar goods for Sipping Wine appears.
2) Buy Sipping Wine.
3) Sell 4x Ice Magicite, 4x Couerl Pelt. Bazaar goods for Monk's Garb does
not appear.
Case 2:
1) Sell 2x Tyrant Hide. Bazaar goods for Sipping Wine appears.
2) Sell 4x Ice Magicite, 4x Couerl Pelt. Bazaar goods for Monk's Garb
appears.
In Case 1, by buying the bazaar goods for Sipping Wine, you reset the
counter for Tyrant's Hide to 0, hence resulting in the bazaar goods for
Monk's Garb not appearing after selling the Ice Magicites and Coeurl Pelts.
But, in Case 2, by not buying the Sipping Wine until you sell the Ice
Magicities and Coeurl Pelts, you get both Sipping Wine and Monk's Garb
available in the bazaar.
This works for every bazaar item that has common requirements, and the
selling order does not matter.
Taken from FeuFeu's Guide to Loot/bazzar Goods from gamefaq.
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