For a local welding supply store on basic everyday items, many go through middle men. Online stores are often dealing directly with the factory or company. Their markups are typically higher as well with 50 or 60% profit margin, whereas online stores will settle for 10, 15 or 20% to keep volume flowing. Online stores also often keep minimal inventory and can drop ship direct from the manufacturer...Brick and mortar stores that want to stay in business will have to start doing internet business to stay competitive. Airgas does, but you get no better deal than you can manage locally. Welding gas will always be in demand so, you can expect them to stay around.
I have to hand it to my local guy though...even though I deal with Airgas in the next town over on my cylinders and gas because they are aggressive on price, they cannot beat my local guy for convenience, having it, and giving me a really good deal, comparable to most online stores, especially if it is nickel and dime stuff, or even a roll of wire. It's a small store, part of a small chain on the east coast, but I almost always manage to find exactly what I need if it's 4:50 pm on a Friday. I can/have called him up on the number posted on the door on a Saturday morning in desperate need for a roll of wire, even though they were closed. By the time I got up there he had come in and had it sitting beside the mailbox. He left a note to pay him on Monday. I don't have an account with him since I have Airgas account and can charge whatever I need and have them drop it off to me, but I go to him first. I randomly check in with Airgas before I go though and he has never failed to beat the price without me having to tell him what Airgas would let me have it for. And if he is a few cents higher than online, it beats the wait time when I need it now, and I don' t have to get together a 25.00 minimum order or pay shipping. Price for his welders is good too...but I don't have a need for those.