It's a private owned place, and, sure, those are not retail rates. 125's are handy for truck use, I'm still spry enough to carry a 125 over my shoulder. I do need to buy a couple more tanks to get myself sorted out properly. I think I'm going to lash a 330 argon to my welding bench for my scratch start setup.
You do pay a pretty penny if you're getting the exotic stuff, 92/8 spray arc or an oxygen mix is $65 for a 330cf, don't ask me why. Because it's an exchange system, perhaps it has to do with overhead and labor costs?
Regardless, they take care of me and have pretty decent stockage, so I keep doing business there. It's Chicago, so cost of business is pretty steep. S/F....Ken M