Another vote for the Midway/Frankfort Arsenal tumbler. It is $45 retail, and a bit under $34 if you have a C&R. I do, and I got mine about 2 months ago. I had thousands of cases of all sizes that needed cleaning, and I ran the thing damn near constantly on two weekends and for about 5 hours every evening in between. No hiccups, no problems, clean cases. I only wish that it was bigger, but for $34 I can't really complain. Anyhow, now that my bulk tumbling is done with, I usually only do a cleaning when I return from the range.
One of the goals of reloading is to save money so that you can shoot more for the same amount. Saving time is also important, because your time is worth something. The Midway product is quite cheap, yet has a pretty decent capacity. Buy it, and then go to a pet shop or (better yet) a feed store to get walnut and corn media. You'll be out the door on all of it for well under $100, and have a supply of media that will last you years.
Another tip - take a used fabric softener sheet, rip it into 4 pieces and toss them in with the cases and media. It cuts down on dust, and helps to keep the media cleaner (thus resulting in better cleaning for your cases and a somewhat longer life for each batch of media). Of course, toss them out each time you run a load of cases and replace with a new sheet. If you have a family, you'll have no problems with the supply of sheets.