For some reason I thought you were around Canton. If so, there is/was an AirGas in Holly Springs. They sell other welding/cutting equipment as well and could probably get you set up with the size you need.
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Thats why I bought mine from Northern I guess. Rental doesnt make sense for the home gamer. I have no memory if they sold it full or if I had to go to Airgas though.Sidney Lee in Douglasville doesn’t sell the large tanks, only rents them. I bought a 125cf tank from them a few years back, but can’t remember what it cost. Costs about 50 bucks for straight argon fill…
You would rent the large one by the year and they exchange them for full ones when you need it, but you buy the gas…