Yup, dis one...
http://www.midwayusa.com/eproductpage.exe/showproduct?saleitemid=414369&t=11082005
Get some corncob media for polishing, needs to be fine-ground, not the big, coarse stuff from Wal-Mart or pet stores. Get it from Midway, or any gun shop should have it.
Get some extra brass case polishing liquid too, avoid anything with ammonia in it, like Brasso, ammonia weakens brass. NuFinish car polish works good too. The Frankford Arsenal stuff that comes with the tumbler is good too, just order some extra.
I prefer to clean my cases in one step, then polish in a second step. For cleaning, I go to PetSmart and buy "Kaytee Walnut Litter". It's ground walnut shells for bird cage litter, and it's small and abrasive enough to work great for scrubbing cases. Then, I'll polish them with the softer corncob media, with the liquid polish added in.
Put the corncob media in the tumbler, approx. 3/4 full, add 5-6 tablespoons of polish, then run the tumbler 5-10 minutes to let it all mix together before you put any brass in.
You might also want to pick up some 2-gallon plastic paint buckets with lids from Home Depot, those are great for storing your media in. Great for keeping brass in too. I have one full of 9mm, one full of primed .40S&W, several full of primed .45's, and a couple full of baggies of various other calibers. 3 quart Glad food storage containers are great too, one of those holds the perfect amount of media for a tumbler.