you should try ice cream places for dry ice. all the baskin robins and dairy queens in my area always have a nice stock of it for real cheap. i pay 1.50 a lb i think. i like to get 2 lbs, cause it can make smoke for hours...enough to kill an army of rats. once my breeders start popping babies i will be gassing quantities. i never messed with the paint pall canister method. i play paintball alot, and have seen some people get seriously hurt from one of those canisters flying off from the pressure. not something i feel safe messing with... besides i love the fog dry ice makes, i do it on my porch at night, and it looks so cool when the green light reflects off the thick fog.