How much does it cost for radio advertising?

http://www.rtir.com/index.html try these people

Good Question, although the competition from the car dealers for airtime must be pretty nearly impossible. The answer is probally "More than the car dealers are willing to pay"

It's been said if you have to ask, you cannot afford it. The truth is that radio advertising is expensive; however, you might be able to twist your message to receive free radio publicity. It cannot be a direct attempt to make profit but if you sponsor a local event or have news worth sharing in the community, the radio stations can give you mention. This is true also for tv coverage. Check out the book, "Marketing without Mega Bucks" by Shel Horowitz which I found in my local library. It'll get you on track with some innovative ideas.