We recommend renting a large C02 tank from a local welding or gas supply. Then use our "CO2 Fill Station" to fill these small tanks. You could also have them filled by local paintball stores or sporting good stores.
How long will a full cylinder last?
It is difficult to calculate. We have run tests with a small pop-up prop that uses a 3/4" bore cylinder and were able to get up to 12 hours from one tank with a 20 second delay between activations.