I had no idea you could buy this stuff without a license and have it on hand for your AC guy. I started by buying R22 when my AC guy said he couldn't get it. That worked so well that I bought a backup supply for my other AC units that use 410A. Now, no matter who the AC guy is, there is no excuse for running back to the shop for refrigerant. I have it on site and they can finish the job right then. This it better than insurance! And, MUCH cheaper than what the AC guys charge! Do it now, it's not going to get cheaper! It ships out of Ft Worth and only took a few days to arrive.