Florabunga, Any professional commercial insurance agent can handle what you need. Look in your phone directory under insurance and look at the larger agency's ads. They will ususally say something about business insurance, binds, etc in their ad. Not difficult to find. Good Luck!
And get several estimates...(or use an independent agent who will get you the best rates.) I was amazed at the difference in costs...from $1000 per year to $300 per year for the same coverage!