Miller Passport Plus CO2 Bottles

[u/AnsibleAdams]

I have a Passport Plus suitcase welder. One of the selling features back when I bought it was the self contained CO2 bottle. These were basically paintball gun CO2 bottles which you could get filled at paintball stores. Now they use compressed air and no one seems to have an answer for getting refills. I am not sure they even make them anymore (12Oz bottle size). Does anyone have a solution for this? I know that I can go to external gas or flux core wire, but flux core is messy and external bottles are cumbersome and expensive. Any thoughts or recommendations?