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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