Quoted from Plumonium:
Any of you guys using this Tumbler:
Frankford Arsenal Quick-n-Ez Case Tumbler
amazon.com link »
I think I read above not to buy it but it has good reviews on Amazon and is the cheapest as well.
I've had this one for 2-3 years with some heavy use. It's help up better than my HF version. But know it won't be a lifetime purchase. If you're in the hobby long term, you might as well get the better and bigger ones.