i use these guys
The CG&B Group Inc. - Business Insurance — Media
i should say that i migrated over because i had been using them for video and photo shoots and still do on occasion. i haven't had to file a claim yet so i can't speak to the service but they seem OK.
i'm sure there are much cheaper ways to go but for my needs i need liability insurance and a bunch of things for shoots that you may not need.
worth giving them a call.