All other distilleries closed at one time or another, although Glengyle is in the process of being re-fitted. For more info on the distilleries of Campbeltown yore and where they were, check the map of the town I tried to reconstruct at www.celticmalts.com/journal-a4.htm
A book about the history of Campbeltown as the whisky capital of Scotland is in preparation at the moment (no, not by me!).
As to bottles from these old distilleries, they do sometimes pop up at auctions.