Went to Airgas in Independence (closer for me than KCK), and for the 80cf tank filled with Argon/CO2 mix, the total was $290 ($220 for the tank, $39 for the gas, plus tax). I'm going to try Praxair tomorrow - it's a little farther to drive, but if I can get it for anything close to what Cletis got, it'll be worth it. I'll post an update if anyone is interested.
