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Looking for a reasonable place to refill my CO2 cylinder. Plan to use Cal Tool (Sierra and I) but last time I went they weren't filling CO2 so need a backup. Fire Ace would be my last option, had to use them for a re-cert and fill and they are EXPENSIVE! Anyone got a decent option they use regularly?

I usually swap cylinders at Praxair on Sierra, but that doesn't work if you have a nice aluminum tank you want to hold on to. The price is reasonable, though it seems to fluctuate a lot.