Around here, Menard's sells both wine casks and whiskey barrels in the spring. Most (not all) are sawed in half to be sold as planters. They mark-down what's left in the fall, so...
Last month, my wife & I ran 1.5 Jim Beam barrels thru a chipper. Close to 70# of Jim Beam chips. Might have to put 'em in the will. If you know somebody with a decent chipper (6" width) make a deal with 'em. Wimpy chippers won't get it done.