tweeter for B&W CDM1

A colleague of mine has a broken tweeter in his B&W CDM1; the italian distributor told him B&W is not supplying the part anymore.
Some adviced to search at some big retailer who may have the spare part as a leftover, maybe in the USA, so: could you please tell me the name (or give me a link) of some important B&W retailer in the USA ? thanks, regards
daniele