They sell whisky in the Minnesota stores too, although I've noticed of late that The Macallan is no longer available, crud.
A year or so ago, the manager pulled me aside to whisper that their store branded whisky (read: private label) was actually 18 yo Macallan. True? False? Don't know, since I was so deep in bottles at that point, putting a Costco bottle on the bar didn't light my fire.