"and when I went to replace it, Depot on longer sells them. And wouldn't sell me their display model?"
I had an experience like that at a Sears store once, long time ago. I had just busted a large hex wrench (last POS from China
that I ever bought) and cut open a few knuckles and said, gee, if I hurry I can get to Sears and buy a Craftsman.
And there was one wired onto the display shelf but none in stock for sale
. So I explained very nicely to the manager that he did in fact have ONE WRENCH which I intended to buy, and that if he wasn't going to take it off the display, then I would have to take it off the display, because I was there to buy a wrench and THAT ONE WAS THE ONLY ONE HE HAD.
He took it off the display, and I have it to this day.
I would suggest you go back to that "depot" and exlain to them that if they aren't going to stock and sell any more of those lights, and they do have THAT ONE ON DISPLAY, that they need to take it OFF DISPLAY AND SELL IT TO YOU before you contact corporate and try to explain that the store manager must be discriminating against you because he has the part you need BUT HE REFUSES TO SELL IT TO YOU even though it is the last one left.
Be polite, but adamant. When an idiot realizes that you just won't go away, usually he will do what you keep telling him to do, just so you will go away.
"Foam cored double stick Scotch tape." That's usually sold as an "interior grade" product. They make a "rubbery" cored tape that's more durable for exterior use, doesn't break down in heat the way the white cored stuff does. But honest--there are specific adhesives for this job.