[NAME, COMPANY AND ADDRESS, ex.
John Smith
XYZ Inc.
1234 First Street
Suite 567
Anycity, Anystate  85245]
 

Dear [NAME, ex. John Smith], 

We would like to do business with you.  Our firm is interested in [LIST PRODUCTS, ex. the following products for immediate delivery:

2 A34 model commercial compressors
300 yards of 4 1/2" A34-compatible tubing] 

Although we have already obtained a quote of $[AMOUNT] from your competitor, I am confident you will be able to quote us a superior figure.  Please contact me at XXX-XXXX by [DATE, ex. Friday].

It will be a pleasure to do business with you. 

Sincerely,
 

[YOUR NAME, ex. Jill Jones]