One thing to add about Lush: they have some very hard-to-find whiskeys that aren't availiable anywhere else in the area. These often have price tags to match, though.

About the only one of the "unavailables" that I can afford is the Four Roses Single Barrel, otherwise only available in Kentucky, in the export market, and (recently) NYC.
If you're looking for something out-of-production or extremely rare (like Wild Turkey Tribute, Weller 19yo, or one of Buffalo Trace's Experimental Collection), and prepared to pay the freight, you'll likely find it there, though.
Oh, no! You have walked into the slavering fangs of a lurking grue!