As OP mentions it's a good way to get a "new" tank. Newer tank.
I did this once at Lowes and the clerk mentioned it wasn't like picking a lobster in a fine restaurant's tank!
Just wanted what we all want, shiny paint implying there aren't 8 layers of grey paint and rust.
BJs wholesale is my cheapest fill spot, but I'll try Tractor Supply when my membership runs out. BJs is also (shh) "cool" and usually gives non-members the member price. The tire guy runs his own domain.