Yes, I have also seen them at those stores.
I have a hard time locating the 5#ers. Yes, they will order them for me but the price one pays is enough.
The last 2 I have purchased I have gotten from people that don't use them any more. I paid $20.00 and $15.00 for the last 2 but one needed the new OPD valve and that was an extra $20.00.
Still for the two, I have a total of $55.00 in them.
I would still like to find 1 or 2 more. They are handy little tanks.
You may believe the grass is greener on the other side. If you take the time to water yours, it would be just as green.