Are you absolutely sure? The vast majority of cars have a way for you to re-program keys, key fobs, etc. provided you have at least one master (not valet) key available. You may have to look in weird corners of obscure forums, but you can probably find the procedure. I did this recently in my car and it involved pushing the brake pedal 8 times, accelerator 7, turning the wheel left-right-left, etc. It sounds like a ridiculous wild goose chase, but this is the sort of thing you can expect from car manufacturers.

Ford requires TWO working keys to progam a new one in the car.