This lovely Bianchi 175 is for sale on eBay right now, helpfully listed with "reserve price quite high": I'd also caution that this is the seller I bought my disastrous Guzzi 125 project from. Let's just say many eBay sellers won't leave feedback for a buyer until the buyer has left feedback; odd really, given all a buyer has to do is pay and maybe collect, and only then will any problems become apparent. So beware 100% seller feedbacks.
But that doesn't stop me wanting a pre-war Bianchi. Ideally an ex Tazio Nuvolari Freccia Celeste as featured in Benzina issue #4