I was in Target today and picked up a couple of flexible tubs to use for a water bath to cool my fermenter. They were in the clearance section for $1.49 a piece!
They're a bit smaller and flimsier than the rubbermaid tubs (10.5 gallons) but look like the perfect size for my fermentation bucket. It's a little bit of a tight fit (need to use 20 oz soda bottles filled with ice instead of 2 liters) but that's a good thing for me since i don't have a lot of space anyway.
Figured I'd pass on the info in case anyone else is on the market for one