Demand has risen dramatically for America’s native spirit in recent years, fuelled by a rediscovery of bourbon by a new generation of connoisseurs. This has put a serious dent in the supplies of these ultra-aged premium spirits, magnified by the public’s current penchant for ultra-aged bourbons, such as Wild Turkey Master’s Keep Aged 17 Years, which of course takes 17 years to produce. In-demand bottles – think Pappy Van Winkle, Four Roses Limited Edition Single Barrel and W.L Weller – have disappeared off the shelves recently, simply because it is a product that cannot be rushed. However, the good news is, there are still liquid treasures to be found. Here are four luxury bourbons that are available if you search diligently—and soon!