I found those a year ago. Think it's industry's answer to cheap, maybe disposable kegs.
New ones are $60. Oh, my bad, $59.95.
A ss Corny is nearly indestructible, can be pressured to 130 psi, is slim and stackable, easy to reach inside, etc.
As the man said: Buy once, cry once. A ss Corny will outlast YOU!
It's your nickel.