Am I just lucky that I live in areas where Airgas and Haun have outlets? I've welded for 30+ years and bought probably 1000 lbs of CO2 in my life, in both Charlotte NC and here in Syracuse, and never had an issue. They take used 10 lb bottles and just swap them out for new ones for $18. They sell washers for pennies. I would never go to the trouble of buying an aluminum bottle because I wouldn't trust the local homebrew store to do me right. And I don't think Airgas or Haun will touch them. This is a curiosity to me.