Here's a two-for-one Classic Ad Watch deal from the darkest days of the Malaise Era. First up, a Gladding Chevrolet (Maryland) offer for a Chevette with factory air for just 99 bucks a month. Before you jump in the time machine to take advantage of that sweet deal, however, consider the '79 Mercury Zephyr, which was cheaper than both the Toyota Corona and the '78 Zephyr.