Most welding gas supply houses like Airgas will just exchange a filled certified bottle for yours and some money. If you have a sentimental attachment to your specific bottle, the weld shop can send them out also.
I went to hydroponics store in Newark, I pay $7 for exchange 5 lbs. They have great condition Aluminum tank with certified in exchange for my old tank.
I took mine to what I thought was Airgas (cuz the tank was Airgas) but it was Alliance welding. And because the tank was from Airgas n not from them, they charged me for a hydro n a refill (tank swap).
The total came up to even with what I would have paid for a hydro n no fill up at a scuba shop I was going to take it to so I did the swap. Came back with a newer looking tank and now all I need to do is go back to Alliance when I need a refill n swap out a tank for a small fee.
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