What's the best time to buy a TV? Not just Black Friday. Shop strategically during these 4 windows.

You can find a TV on sale whenever, but the best discounts only pop up a few times. On any given day, poking around for TVs on sale is all but guaranteed to turn up at least some decent steals. But of course, retailers don't casually offer their absolute best TV prices year-round. So, when is the…