Watch the scams on these. They make you buy a new bottle, but many of them just swap them out and bam, your "new" bottle is now old. If you buy a new bottle make sure you can get that one refilled, not just swapped for another. If you need t ogo the swapped route, buy a used one. I think you need to pay attention to the dates on their manufacture, and make sure its pressure tested?
We deal with Norco out of Boise. We have 6 N bottles, all of them owner bottles. NOne of them were "new". We exchange the tanks when empty. Norco is responsible for pressure testing, valve replacement, painting and haz mat labels. Oxarc, another of our suppliers, carries a $10 million liability insurance on the bottles.
Now, if you have an odd-ball tank or off brand, the pressure testing, valve replacement, paint, haz mat labeling in your responsibility. In that case, if you bought a new tank, you will get your tank back. Be prepared to wait for the return of your tank.
At the Parts house we always laughed when someone brought in a tank for "refill", that had been purchased at an auction. We had to tell them the tank was owned by someone else, and they had no legal claim to the tank. of course, they did not believe us, until they had been to other outlets and were told the same story.