We have a local gas supplier I have an ongoing relationship for CO2 (for my soda dispensor) and Nitrogen (for the wine bar) and they sell oxygen for Medical and Welding. Originally they had offered to one day turn around filling my tank by sending it over to their facility across town (the place I pick up my other tanks near Dulles airport doesn't actually fill things there they just distribute them). Subsequently, they decided that they didn't want to do even that.
On the other hand, I've gone the other way. We were doing welding on the fire engine and the guy I'm working with curses that his O2 tank has run out. I point out we have all kinds of oxygen on the ambulance and went and grabbed the thumper bottle.
When I had my aircraft step that needed chroming I took it to the local motorcycle shop who referred me to the machine shop next door who referred me to a metal plating place up in Baltimore. With great trepidation I told them what this thing was I was giving them, but they didn't seem to care. Came back looking beautiful.