You could try
http://ourworld.compuserve.com/
He lists some Bianchi decals, but I don't know if they're the ones you want. He also has decals of some makes which aren't on the list, so an email might produce results.
Neil Foddering Weymouth, Dorset, England
>From: Terry Farrant <tgf1@shaw.ca>
>To: classicrendezvous@bikelist.org
>Subject: [CR]decals
>Date: Tue, 25 Jul 2006 19:26:29 -0700
>
>i am looking for a source for vintage bianchi decals (1982). i was
>hoping to get some from michael swantak but i can't seem to get a
>response from him. all the ones i have seen on ebay are the wrong
>colour, i am looking for the navy blue ones.
>
>terry g farrant
>north saanich, british columbia
>canada