I have been getting my CO2 from Praxair out on Benner Pike across from U-Haul. I also heard that Best Event sells CO2 at $2.85/lb. I think Praxair is cheaper.
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That's where I go. They are also called GTS-Welco. The big tank out back says Praxiar, and the street sign says GTS-Welco. Just past Dick's homecare. I'm not totally sure the cost, but most of it is for "labor", not the CO2. It only costs me ~$8 more to fill my 20 lb tank vs my 5 lb tank
That reminds me, I need to get my 5 lb tank filled