I should have it in the autumn at my shop in the viadukt. As an alternative try my belvoir ginger cordial. It's much more spicy and makes the best whisky mac, mx 50/50 with the whisky of your choice.
We recently bought some of the cordial from the Viaduct. While it is good, and spicy, I just don't think it works as well for a whiskey mac. But hey, sometimes you just need to admit you're far from home. I've checked in lots of places as well. Anytime I pass a liquor store I try to find Stones, but to no avail.