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The last time I built one was in highschool, and the only dry ice available was $11.00 a pound.The local meijers store here has dry ice for sale at 99 cents a pound. At that price I think an old fashined dry ice fog machine could be economicaly viable. a steel drum, a dipping basket, a bathroom vent fan, electric water heater element and some dryer hose. and viola' creepy clingy fog.