Dry ice is at like -103 degrees F (-78C) - unless you have something that can get that cold, chances are you won't be able to store it, any warmer and it will continuously sublimate. You can keep it in a particularly cold freezer wrapped in a paper bag for a few days - but it will eventually disappear. Just buy it as you need it, will save you some effort. What ever you do, do not store it in something air tight, build up of CO2 gas can actually cause the container to explode.
Ham