You may have been offered GAP insurance by the dealer when you bought your car. They may have called it something different, like Shortfall Insurance, Invoice GAP Insurance, Combined GAP, or Purchase Protection. If you didn’t go for it then, that’s probably because you were put off by the high prices being quoted.
The good news is that you can get GAP insurance peace of mind without having to pay through the nose for it simply by going direct to an insurance company like ALA.