I know a few places that carry bianchi bikes and accessories.
http://www.broadwaycycle.ca
and there's a shop that's at the north east side of Bloor and Runnymade (they have a website, but I keep forgetting to write it down.)
not much selection on bianchi's at either store though. broadway has a pista and a commuter with some accessory celeste coloured stuff, while the other has what looks to be an axis and axis frame.