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What's the size of the bottles you're using? I image if you weld titanium professionally you go through quite a lot of argon quickly.
I bought a 200 bar 20L filled cilinder for €300. It's part of an exchange system were you 'own' the bottle. You exchange your bottle for a new one at one of the so-many exchange points when it's empty. A refill should be around €50, I think. I'm in the Netherlands by the way.
TIG welding. Should I get a huge 30L argon cylinder or a more manageable 20L bottle?