business letter

My name is Krystle, I just started a new company called iflash clothing. The web site is iflashclothing.com. I sell custom LED/Electroluminecent t-shirts. I would like to target event organizers, major companies... What I want is for someone to write a simple "business proposal" or "proposal letter" to the St. Lucia Tourist Board. They are the organizers of an event called St. Lucia Jazz Festival. So basically, I want to do business with to sell my t-shirts to their guest, audience tourists...