Promote Web Site

I have a website and am offering a great promotional offer for the rest of the year- if users are not quoted a lower instant car insurance rate for the same level of coverage they currently have then I will reward them a $100 check. I am partnered with 3 leading insurance companies and have arranged for special discounts for my web visitors. It only takes about 2 minutes to get a quote from each company. So visitors will either save hundreds of dollars on car insurance or be paid a $100 guarantee if they are not offered a lower quote. Please tell me how you would promote this offer to make certain that people realize what an incredible offer this is. If you offer an effective campaign then you will be offered continuous work throughout the year.