Welcome to the forum! That Island Dry Ginger Ale marking is interesting, I don't remember seeing that before. I've got a green one but it's not marked Island Dry. I think these are fairly uncommon bottles, not sure what the market is like for them these days though. In general Nanaimo Bottling Works bottles are tougher ones to find compared to other bottlers in the area, I find (except the ones with the picture of the bottle cap on them, which are fairly common).