I come here often for my job, buying just about anything but my review is personal. I come to the rear part of the business, the gas plant, to get my home kegerator CO2 bottle filled.
Very easy and they are familiar with what you need. Drive through to the back, bring your bottle in, don't forget your gloves...
Walk inside and tell you need to be filled up. In about 5 minutes they will return with a freezing cold, iced up bottle (where the gloves come in handy) and your good to go.
If your bottle is "out of spec" meaning beyond its inspection date, they will need to hydro test it before filling it. Its the law and no way around it. That is $18 plus the cost of the gas once its done. Problem with that is if your in a hurry, it takes 2-3 weeks to get tested off site. They do have in house bottles they can lend you till you get it back if your in a serious bind.
I don't know if they offer "beer gas" which is a nitrogen-CO2 combo. read more