Whiskey barrels pop up in this thread quite often. Just keep watching it.
Yeah, I was going to mention this guy as well. I think he gets them from a distillery in Madison, WI (Old Sugar Distillery) that ages in 5 gal barrels. First thing I thought when I toured was what they did with the old ones. I know originally they were doing mostly honey liquor and rum, but they've been putting out a sorghum whiskey just recently, so if you keep an eye on that thread you might be in luck.