One of our carriers listed on our Insurance Products page of our website will be able to quote you for the commercial auto insurance policy you would need for limousine / livery service and ambulance service.
If you need personal car insurance as well we can quote you for that at our main CarInsurance.com page.
If our affiliates are unable to provide you with the ambulance and limo insurance that you need on your vehicle or fleet of vehicles, then you may want to check with your state's insurance regulator to see if they have a list of automobile insurers that provide coverage for these types of specialty vehicles.
The insurance regulator for your state can also advise you about what types of insurance coverages are required for you to run a limo and/or ambulance service.