Here:
http://www.nicksmusic.it/niccolai/home.htmIn Pisa (San Giovanni alla Vena)
They used to have a store also in Florence but i see now that they have closed it.
You can go and have a live look if they have the model you like...
Best prices in italy are probably here:
http://www.merula.com/It's in Bra near Cuneo...not exactly around the corner but once you have made up your mind
on the exact model you want it may be worth some hour drive.
I usually don't buy music instruments online or from foreign stores, i always want to at least try them once first if i can, even if i'll end up
paying more, so apart from the already mentioned mercatino musicale and e-bay i don't know other auction places.
She had that Camarillo Brillo, flamin' out along her head...