I have dealt with wholesale gas vendors and they don’t fill on demand so you have to leave it with them and lord knows what day they finally get around to it. My local welding surplus shop will stop and go fill it for you but they are none too happy about it when 90% of the clients just swap a tank and go.
Especially when its -10f out and they have to put on a parka , grumble then stand there for 5 minutes while it fills, grumble then come back in and take off the parka, grumble… I think you get the picture…I experienced this once years ago and now I have a 20Lb used tank for main kegs that is swapped and my “new” 5lb was traded in for an “old” one years ago as I dont have time to BS around about filling a “special” shiny tank when I understand full well that I could have bought a used one years ago and never had a run in with the grumbler!! LOL Look I live in St Paul/ Mpls and have tons of shops but the majority are simply swap based and also who needs a shiny brand new CO2 tank anyway is the gas on display or the kegorator?
Edit* moral to this story is save yourself some grief and go the used/ swap way UNLESS you plan on having the tank on display in some fashion then by all means go the expensive, grumble half the time BS route.
Are you feeling your being helpful by listing that your vendor seems like a sweetheart? That’s great for you only. I would argue that most shops will be none to happy to stop what their doing and go fill your shiny tank when their primary business is swap based and they have their lowest tier employee do it all day long when they have enough empties. If your lucky enough to have a fire extinguisher co local maybe they will take the time but most of these guys also que up a bunch to do at the same time. Maybe you can list your sweetheart shop for others in your area?