guys that weld with c02/argon mix

My local supplier is Oxarc. They are very good at trading tanks, IE I once had a nitrogen tank I used in HVAC/R for pressure testing, and traded it in on CO2 for my mig.

I recently had a VERY small CO2 tank, and they upgraded me for very little to a larger size. Turns out that there is some purpose by which the smaller tank I had is in more demand than the larger one I bought, it cost me very little.

So if you don't need your Oxy/ Acet at all, you might ask your supplier about a trade.