I just got back from The Great Escape and they're having an unadvertised liquid chlorine special: 4 gallons for $8.99. Yes, it's 12.5%...no, there isn't a limit on how many cases you can buy. The manager told me their stores in Chicago are in a price battle and are trying to undercut a competitor. He said the special may only run a week or so, but he wasn't sure.
Unfortunately, The Great Escape only has stores in Illinois, Indiana or Ohio.