I use a welding supply place. It's been posted that welding grade is as pure as medical grade since impurities cause pock marks in welds. It costs $10 to fill my 5 lb bottles. I think most people either use welding places or homebrew stores.
Our company uses Matheson Gas, they have the best prices locally. Although saving 4-5 bucks to drive a little further isnt a great savings for just one bottle so I would just go with the closest gas company to you. JMO
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