Do what I did and get a SCBA 4.5k cylinder and a few fittings. All said and done for around $320. The fittings aren't cheap, but now I can fill at 4500. I fill my SCBA at the local fire station, which is walking distance from my house.
If you're only looking for 3k fills go with a couple used scuba tanks and a scuba fill station.
If you're only looking for 3k fills go with a couple used scuba tanks and a scuba fill station.

, though gov. auction might prove worthwile
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