State Farm offers E&O coverage.  Based on my experience and those of other's I've talked to around the country, they are significantly cheaper than their competition.  When I read through my policy it all seemed to make sense.  They weren't excluding anything major.  Just contact your local agent.  (Some local agents don't know that E&O is available because none of their customers have ever asked for it.  If you get one of those, assure them it is and ask that they contact the company.)