My dad was a regional manager for Praxair, covering gas and welding alloys. I used to get cylinders for close to nothing, and it was good. Then I got stuff at cost or a great discount. Eventually, like now, I have to walk in the front door and plunk down my credit card like any other schmoe. I own a lot of gas cylinders, and some of them sting more than others (Ar/CO2/O2 mix), but its not all that bad. Larger tanks save more money and go dry less often, if you can fit them on your cart (and in the back of your compact Hyundai to get them home).