Do you know where to purchase dry ice?
Dry ice can be bought in a lot of weird places -- chemical supply houses, welding suppliers, ice cream places, beverage outlets sometimes -- there's a couple of directories online where you just put in your area code and they give you nearby suppliers. Here's the one I have bookmarked:
but I bet there's others if you google "buying dry ice" or something like that.
YES! I'll call and see.