Hi please help me find a sample of business-to-customer introduction letter, I really need it urgently, thank u..

Microsoft Office Templates are provided free of charge, and offer a lot of great ideas. I would suggest looking through their "Sales Letters" category. Find one that is similar to your needs and then personalize it with your own wording.

The best practice is to get to the point in bold headline, perhaps above the salutation. Example:

Vendor Name
Vendor Address

Your Name
Your Address

Introducing our new line of ACME Widgets at 30% off for New Customers!

Dear (Name);

{Enter your letter here}