Or if there is no such thing, what is the cheapest route to go to get customers to your website?

I think that the best is build back-links with your keywords in the anchor of the links. Usually you can build them posting in blogs comments but with your niche site it is a little difficult to find blogs that are related to it (they must be related). So I should write articles that link to your site and should send them to sites like ezinearticles.com (it really works).
Second I should build 2 blogs in blogger.com and lenses in squidoo.com with this rules:
Your keywords in the title, and 3 or 4 times in the body of each article in the links to your site. The articles always related to the main theme of your site,
If you can write some good content in your site and then social-bookmark it (digg, mister wong, stumble,…) With you aren’t targeting to get people from this sites to go to your site, but you will have a back-link from a site with a very nice Pagerank so Google will notice this.
Finally, if you aren’t subscribed to webmaster tools and google analytics, subscribe your site and send the sitemap.xml. If you don’t have any, you will have to create one, because is esential for Google to index correctly your site. Have in mind that in the sitemap you can tel Google when do you want google robot to visit you next time, and you can set a frequency for each page.
http://tinyurl.com/spiderden : In this site you can buy traffic. If you are in hurry this is an option.
http://tinyurl.com/wildseo Here you can find a good reading to learn how to rank in msn, yahoo and google.
http://tinyurl.com/s3o-elit3 Finally this is a powerful tool that perhaps you know. It has been created for ranking in Google playing with keywords.
I hope this tools may help you!
Good luck!

I am the only driver in my household but I plan to get my son a car and register it under my name and put it on my insurance. He has a license and lives at a different address. Would the insurance company get suspicious about anything?

Yes, they will want to know why you have 2 cars and only 1 driver listed. It would be in your best interest to add your son to your policy bc what would you do when he gets into an accident in your car and your insurance won’t cover it?