The appeal in this letter is to save money. Know your target audience. This approach won't work if the reader is more concerned with quality, location, reputation or some other attribute besides price.
1234, Main Street
Boston, MA 02123
09 April, 2005
<Recipient Address Goes Here>
If all <type of product or service> basically sell the same thing, why are some so much more expensive than others? Overhead. It's a simple fact of doing business, the higher the volume and the lower the overhead, the lower the price. We <how you are able to offer lower prices>.
encl: <List of enclosed items goes here>