how much for cost of lodt key

Depends on the Tech level of your vehicle, most have to be done at a Dealership due to programming requirements, so around 500 bucks. However, if you have what is called a smart locksmith in your area that has all the equipment, they might be able to come to you cut and reprogram the vehicle for the new keys it will be cheaper. If you don't have one, then you're stuck with getting it towed to a Rover dealer and bite the bullet. Good Luck