I got my setup here:

http://www.stainlesstumblingmedia.com/

At the time they were selling kits with the Thumbler's Tumbler, which is a very good piece of equipment. They still offer the Thumbler's, but I think separately only and it looks as though the kits include a new design which I suspect is every bit as good. If you go this route, get the media separator too. Another useful item is a large and powerful magnet for dealing with stainless pins that try to get away (I know it's stainless steel media, but it's magnetic...and that's a good thing!).

I know lots of guys don't give two hoots and a belch what their brass looks like, but I just do and I suspect I'm not alone. Besides, clean brass is easier to inspect...and you with stainless tumbling you get brass that looks brand new, inside and out---including primer pockets. I'll never go back to walnut and corncob.