Just returned from a weekend in Las Vegas. As other have reported, most of the hotels / restaurants have a disappointing selection of bourbons. Most don't go beyond Jim Beam white / Makers Mark and (maybe) Wild Turkey. Some of the higher-end steakhouses will add the Beam small batch collection (Booker, Bakers, Knob Creek, Basil Hayden ) to these. I did find Balanton's in several places as well as Bulleit.
On Saturday my buddy and I made a great find. A number of the bars in the Bellagio have PVW 15 and 20 and, drum roll please, Hirsch 16 blue wax! We spent several delightful hours alternating between the Hirsch and the PVW 20..... and the best thing is we were comped these since we were playing quarter video poker at the bar! It doesn't get much better than that.