Groupon is offering a Nine-Piece Whiskey-Stones Set from Sparq for just $9! Shipping is an additional $5.50. My husband got a set of these for Christmas and they’re really cool. The idea is that they keep your drink cold without watering it down as ice would when it melts. I don’t see why you couldn’t use them in any drink, not just whiskey.
This is a pretty popular deal so if you’re interested, check it out over here on Groupon in case it sells out!