"Made by Chicago Electric." Hmmm....we have a city by that name in Illinois. I use the Midway (probably now Frankfort Arsenal) tumbler. It works well. Of course, I also have an old Lyman Turbo Tumbler, one of the first vibratory tumblers made, an it's still going strong.
For media, I go to Pet Smart & buy their corncob pet bedding, available in bags up to 25 lbs. For some reason, when sold as pet bedding, ground corn cobs are much cheaper than when sold as tumbling media. For a polishing compound to incorporate into the media, I got some polish from Auto Zone, NuFinish I think. Just get some that has no ammonia, as this is bad for brass. Once again, for some reason it's far cheaper than the polish that's sold as "brass tumbling polish" by Midway, Dillon, or etc.