I store it in a igloo cooler. 1lb might be enough to get your pot pulled down to benching temps. I usually buy 30-40lbs at a time when I bench. I buy it at the local grocery store, it's about $1.25/lb or so. They only carry blocks which sucks, but smash it up real good by putting it into a pillow case and slamming it on the concrete, then bust up the chunks with a 3 lb. hammer.
