Well cant say I have a link to a list but I can lend some info.
If you are playing the original(PSX Tactics) then you should go into the deep dungon's semi-final floor(I think) and there will be lots of ninjas. Often times they will throw very rare wepons if you are high enough level.
If you are playing the PSP version you are in luck, You can do a rendevous mission called 'Littering" where you (Big surprise) fight ninjas. Now I have had the Omnilex(Rare book), Chaos Blade, Ragnarock and more great swords and wepons thrown at me here.
Thats really all I got but I can look into more later.
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