I was in Vegas for a few days from Canada and part of the plan while down here was to pick up 20L of craft beer to bring home with me. A bit of research said that this was the place to go and boy were they right. A couple thousand beers is amazing, a couple thousand CRAFT beer is just insane.
They also have 12 bottle wine shipping boxes (perfect for checked luggage) for about $10 which is better than bringing my own.
And amazing as the beer selection is, the wine selection is double or triple that. It's not my thing, but if it is, then come here for wine too.