You can not buy a separate policy for an SR-22 if you already have an insurance policy. You will need to cancel your current policy if your insurance company does not offer an SR-22 and purchase a policy with an insurance company that does. You can get an SR-22 insurance quote here.

In general regular car insurance tends to be less expensive for married couples. This may not always be the case though if you as an individual had a clean driving record but when you marry your spouse has a driving history with a "bad" driving record. Your rates may be higher due to the motor vehicle record of another person on your policy with you.