tbutman, that 275 gallon container you found on CL is called an IBC, or international bulk container. They are used to ship various liquids overseas on freighters, hence the reason they have the stackable, palletized frames. Those are found everywhere on the local craigstlist in my area, but they typically go for $50 to $60. Maybe they are higher in your area, but that's the going rate down here in the south. If you look a little harder, you might be able to find some in that price range. Just thought I would pass that along.
edit: I have seen people take the frames off of these IBC's, straighten them out, and use them for fencing!