When is the best time to buy a TV? Not just Black Friday — there are 4 optimal sale windows

You can find a TV on sale any given day of the year, but the real record-low sale prices tend to follow an (unofficial) schedule. So, when is the best time to buy a TV? Of course, you could probably guess that Black Friday and Prime Day are high up on the list, but those aren't the only good times to score a big screen at a massive discount. There are a few other times the TV deals will really…