Where can I buy Dry Ice?
We used to get it for free from the local convenience store (7/11 or whatever) - they would receive some of their frozen goods packed in dry ice. Or you can make your own.http://www.youtube.com/watch?v=OFVerpNmEzA
Any of the ice "makers" can help you out. Check your local listings & you'll see numerous companies that can help you out
Look for a company that refills CO2 extinguishers, they sometimes have it