Where do you purchase inexpensive insurance for a rental car?

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Can you answer this question, providing useful price comparisons and the like based on your own experience, WITHOUT advertising a service you yourself provide? I haven't heard of insurance companies having a policy that relates just for rental cars. My suggestion is if your personal insurance doesn't not cover a rental car, to get it directly from the rental car company that you rent from. Should you buy insurance for a rental car? No, if you already have insurance on a car you currently own, it will also cover rental cars