13Deals offers this 9-Piece Whiskey Stone Set for $9.99. Coupon code "WHISKEY40" cuts it to $5.99. With free shipping, that's $3 under our mention from three days ago and the lowest total price we've seen for this set. (It's also a current price low by $1.) Simply place the stones in the freezer before use and they are purported to keep your drink cool without diluting the flavor. It includes a muslin pouch for storage.