My USAA auto insurance premiums are lumped with our homeowners insurance premiums, but I would have to figure around $330/month.
This is full coverage for all three MBs.
Factor in discounts for age (over 25) and marital status (married), and a spotless driving record, which combined, resulted in an almost 50% reduction in premiums.
I paid nearly this much per month as a single man with an old VW, and an even older Chevy Malibu with liablity only...but with tickets on my record...