Well, here in western Maryland, I pay $400.00 per year for liability ins. The policy is 1 million and 2 million for any given year. The policy also covers my trailer, equipment and tools against theft, fire, and God related activity.
The best advise is to get multiple quotes. For example, some companies were asking anywhere from $388.00 to about $900.00 per year for the same coverage or less. So shop around.