Yes, I was fortunate enough to already have a 20lb CO2 tank laying around - you can get a full one for about $75 at a welding supply place (the smaller ones look nicer but cost about the same price). I got the regulator at a home brewing supply place for $35.
I finally ended up with a gas stove valve for my metering valve - but I'm not sure I'm happy with that yet, cause it's too touchy.