Okay Sean..who you trying to snuff out...that stuff will also pull the O2 out of their lungs...thats a tactic taught as improvised weapons. and then when its empty bash them over the head. SO remember that next time someone is hogging your channel

You must have an older extinguisher. Many 5lb CO2 are available in aluminum containers. The aluminum is about 5 pounds lighter than the heavier steel ones.

As for expensive?? Its only $7.50 to refill here I found. Shop around and look more for a place that services CO2 for beverage dispensers (soda fountains) the fire supply places were quoted upwards of $25+ and a weeks service time...I found a place that does both and refilled on the spot for $7.50.
bMark