Somewhat related to finding the Centennial Whisky, if you're ever looking for any liquor and where to find it, use this
http://www.liquorconnect.com/Pages/default.aspx
Search your product, put in your postal code and it'll spit out a list of stores that have placed orders for the products within 12 months. I'd add call ahead to those stores before making a trek to the store, as having placed the order in the last year does not ensure they still have stock, just that it is a product the store carries/has carried.