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Heldring
With bottles of argon, you want to be keeping in mind the pressure they fill to, aim for 200bar+, a lot are around 120, needless to say you get less for your money but appears a good deal by the litre. I don't use my tig welder as much as I would like (due to the cost of gas) but my bottle has lasted pretty well considering and thats 230bar, 30L.