There is a weapons shop that sells many authentic Final Fantasy models.
also, at general games stores online FF models can be found.
One place is here:
Chipsworld FF Models (Ps: SOS, they have a sephiroth model)
I will ask one of my mates when he comes online fore the weapons store link. I can't find it, even though I've been trying for almost an hour.
But I will. Grrr.
Final fantasypendants and stuff can also be found.
But I don' really look for stuff like that so i'm hardly an expert ^^'