Buying car insurance isn't like buying a car. The cost depends on many factors, such as your driving record, type of car, location, etc... Really, the only way to know the price of auto insurance is to get a quote.
The best way to find cheap car insurance is to get a quote with a local agent as well as online. Get several quotes and try negotiating. Many companies will offer a discount if you bundle other policies, such as home insurance, life, motorcycle, etc... Some providers might also offer discounts for certain groups, such as teachers, AAA members, AARP, military, and more.
Speaking with a local agent can be a great way to learn more. Everybody's situation is different, so a conversation with an agent is sure to help.