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I don't know if you all are aware of this site but for instance there is a 500 gallon poly tank in Missouri for $16.00 at the moment. I know this is a good deal but they are all used. Basically this site covers the eastern us but not all agencies.

Don't know if these tanks would be any good but maybe some of you experts would.

http://www.govdeals.com/eas/index.cfm look under tanks.