Buying bmw the idol car insurance can work out cheaper as most insurance companies offer a discount for buying online. This is because buying online saves them time and money on administration costs and they pass that saving on to you.
If you have made any modifications on your car that may have raised its value, make sure you inform the bmw the idol car insurance company as it may increase your premiums or worse, not be insured.
Failure to report an accident to your car insurance company, however minor the accident is, could invalidate your insurance policy. Most insurance companies share information.