Redbreast 21 Year (750 ML) is $324.99 at CBC Liquors, Westford in Massachusetts — in stock now, with pickup and local delivery. We have the taxman to thank for the existence of Single Pot Still Whiskeys. Back in 1785, the Irish government created a tax on malted barley. As a result, whiskey began to be produced with a combination of both malted and un-malted barley (aka green barley). It is triple distilled in pot stills and is unique to Ireland. The 21 year expression is aged in a combination of ex-bourbon and 1st fill sherry casks.