My LDS charges $5. You can buy "air for life" for $99. This is purchased for the tank, not the diver, but you get free air for as long as the tank is serviceable. They also have fill cards, but I'm not sure how much for how many fills.
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amascuba:$4 for 80cf fill.
I would be really interested in figuring how much it costs an LDS to fill tanks by factoring in all their costs such as: .....