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Not all insurance companies will offer Gap Insurance. Not all situations will warrant having Gap Insurance. If you will never be in a negative equity situation, you will never have a need for gap protection. Before buying gap protection, make sure you're not already covered ... lease companies commonly include gap coverage in the lease agreement for their own protection. Some auto insurance policies will also include gap protection as part of their standard coverage. So read the policy and ask questions first!
Gap Insurance can be purchased as an additional coverage on your existing policy or can be purchased as a separate policy with a different company. You should price this insurance the same way you would any other insurance product to find the best deal for your situation. Gap coverage is available in most, but not all states (not available in CT, LA, NY, VA, and WA).
If purchased through a dealer or vendor (these are typically the most costly options), the coverage is typically a one-time charge (a few hundred dollars - often $300 - $500). If purchased through an auto insurance company, it will typically be a small add-on to your monthly premium (that you will continue to pay as long as you have the policy). Before purchasing, make sure the product would cover you in the event of any loss (i.e., natural disaster, theft, etc.) - not just an auto accident. As with any insurance, do your homework first. MSN Money recently wrote an article on gap insurance, "What a car wreck could cost you," that offers helpful information and advice.