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How to buy dry ice
Pick up dry ice at your local grocery or general merchandise store.
Stores that sell dry ice include safeway, walmart, and costco.
Plan to pick up dry ice as close to the time you will need it as possible.
Since it is constantly changing from solid to gas, it has a very short shelf-life. Every 24 hours , 5-10 pounds of dry ice turns from a solid to a gas.