Michters Toasted Barrel Finish Sour Mash (750 ML) is $104.99 at CBC Liquors, Westford in Massachusetts — available to order, with pickup and local delivery. Michter's Toasted Barrel Finish Sour Mash is a unique whiskey that undergoes a secondary aging process in custom-made toasted barrels, imparting a rich and deep flavor profile. This special finish enhances the complexity of the whiskey, offering layers of caramel, vanilla, and spice.