I have a business liability policy that includes general liability ($1,000 deductible) with limits of $1,000,000 per incident as well as garage keepers insurance ($500 deductible), Medical coverage, business property coverage (ie your detailing tools and products), and so many other coverages that I probably will never be interested in, but they just fall into this business policy.
My business policy is through State Farm - as are my personal auto, home, and personal article policies so I'm sure I am getting a pretty solid deal for multiple policies.
Anyways, my premium is VERY affordable, under $30/mo. Definitely worth having.