At that point just buy a a 5lb CO2 tank. That’s what I use in my work van. It’s a bit more expensive upfront but it’ll last longer, it’s refillable, higher pressure, and the cost of refills makes it cheaper per pound of gas. If you want to get really fancy then you also put a regulator on it so you aren’t dusting as 700 PSI but that’s optional. Plenty of my coworkers just tap straight off the tank.
At that point just buy a a 5lb CO2 tank. That’s what I use in my work van. It’s a bit more expensive upfront but it’ll last longer, it’s refillable, higher pressure, and the cost of refills makes it cheaper per pound of gas. If you want to get really fancy then you also put a regulator on it so you aren’t dusting as 700 PSI but that’s optional. Plenty of my coworkers just tap straight off the tank.