Many years ago, before the advent of huge flat-screen TVs, I went to Kmart to buy a clock radio that was on sale for something like $15. I noticed a very large 27" RCA console TV on display, with a sign on top of it that said $169. It was obviously a mistake, because that model set should have cost at least $600, and even on sale it would have been around $400.
"How much is that TV?" I asked the salesman.
He glanced at the TV. "$169," he said.
That can't possibly be right," I told him. "It looks like someone took that sign from somewhere else and put it on that RCA."
The salesman couldn't have been less interested, and he made it clear he didn't want to double-check the price, because it would have meant that he actually had to do something.
"So if I write you a check for $169 right now, I can buy that TV?" I asked.
"Well, plus tax, of course."
So I wrote the check for the TV—and the clock radio—and went immediately to my buddy's house, where I borrowed his pickup. We went back to Kmart, loaded the TV into the truck, and it wound up serving me faithfully for many years. A couple of weeks later I was at Kmart again and noticed an identical TV to the one I had bought, on sale for something like $450.
Unfortunately, there was no similar cock-up when I bought my big-ass 75" Samsung flatscreen from Fry's a couple of years ago.
And FWIW, I've still got my $15 RCA clock radio and it still works great.