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Airgas exchanges a 15# for $28.00. They take the cheap aluminum ones you buy on eBay in trade, and let you trade up for just the cost of the refill, so if you buy a 5 or 10#, you can end up with a 15#. Refills cost almost the same for the different sizes. Sports Authority refills my 24oz paintball tanks for $3.50, every tenth fill is free.
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