[header] How to buy dry ice [title] Pick up dry ice at your local grocery or general merchandise store. [step] Stores that sell dry ice include safeway, walmart, and costco. [substeps] 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.