| | Paintball cylinder
I have read somewhere that the paintball cylinders are not a real good idea. They have a small amount of oil injected into the tank with the CO2 to lubricate the paintball gun. This oil is not likely to be a good thing in any kind of aquarium!
I got my CO2 regulator, needle valve, bubble counter and electric solenoid on E-bay for about $100 CAD landed in Red Deer. I bough my refurbished 20gal tank for $75 CAD. I get it filled at the local Coca Cola distributor. They have CO2 for their post and pre mix fountain pop. The welding shop price to refill was $55CAD and the Coke store was $29 CAD.