insurance company newsletters

Where can I find examples of sales letters to convince companies to buy advertising space in a newsletter?
I looking sales letter sample (s) that persuade businesses to buy advertising space in magazines, newsletters, bulletins, etc. .. The letter I'm writing sales will be sent to local merchants (the service industries such as restaurants, insurance companies, etc. ..) to convince them to advertise in a local newsletter. I'm looking for some free weights drafting that can boost sales of my letter. Any help would be appreciated.
Just think about it for a minute. If you had a great sales letter you want to share with people? Also struggle to find a specific letter. My advice is to look good the sales literature and then see if the authors include sample letters to everyone. Then adjust your "product" and the audience. Of course, its also questionable whether a letter is the best approach, but thats another matter entirely
Good luck with it anyway
Insurance Marketing – 4 Questions You MUST Answer