Well about six hours ago they didn't have any at my local branch and couldn't tell my other half when they would have get some more.Energas have no issues with getting argon. At least, not right now.
Unlike CO2 and propane/butane, you can't keep the bottle corked up forever.
A bottle of Argon/CO2 mixture might separate over time but can easily be re-mixed by rolling the bottle on the floor.






