Well, at least the Lowes in my area sells them. I’ve seen them for sale.
Home Depot does the same
Most of the Lowes/Home Depot stores in my area also sell emergency lights and exit signs, it may be pretty common throughout the US.
That’s right, and most electrical supply stores sell them such a Grainger Industries and ADI Global.
I can’t seem to recall which store did it, but some hardware stores in my country sold exit signs at some point. It’s kinda surprising, when you do not expect that!
I can honestly say I have never been in a Lowes or a Home Depot that sells EXIT signs over here.