If you live in US or Canada and want really cheap car insurance, go to
http://beam.to/low-cost-insurance and click on the second banner from the top. They give free instant quote and it is very cheap. My insurance on my BMW 325 was around $500 per 6 months and their quote was $320. It takes 2 minutes to calculate quote. First banner from the top is also insurance company that gives instant quotes but their quotes are higher.