Dear {First Name},
Why would a {your occupation} write to you about a {business being endorsed}?
It's because I felt it was so important that you find out about {business being endorsed}. You know there aren't too many businesses nowadays that meet your expectations, let alone exceed them. But {name of business} has done just that.
And that's why I wanted to personally introduce you to {business owner's name}, the owner of {business}.
For {#} years now, {First Name} has {tell about what they've done for you and any exceptional work}.
And since I'm always on the look out for great deals for our valued customers and friends, I asked {First Name} if {he/she} could let me do something special for you. After a bit of "friendly persuasion" {he/she} agreed!
So here's the deal: When you bring this letter to {First Name}, you'll get a 15% discount off {anything in the store}! I've enclosed a brochure so you could see what {First Name} has to offer.
Take a look at it and then stop by {Business name} right away. You'll be glad you did.
Sincerely,
{Your name}