This offer can be "limited" by whom you offer it to, what is offered or the length of time you offer it. Highlight the benefits and be specific about what you are offering. Close by asking for the sale.
1234, Main Street
Boston, MA 02123
09 April, 2005
<Recipient Address Goes Here>
I would like your attention and have been trying to think of a way to do it. How about this? If you will <what you want done>.
The reason we're willing to make this offer is <reason>. <Details.>
<Ask for the order.>
encl: <List of enclosed items goes here>