You might also drop by your local public library and look up the names and address of all the "mailing list brokers" in the Standard Rate & Data Service mailing list books, and send them a copy of your sales material. Finally, take down the names and addresses of all the mailing list houses you might want to send a copy of sales materials to, from the Standard Rate & Data Service books.
A good mailing list "all customers" will rent form $50 per thousand, and will be in use as often as you care to rent it out. The best way mailing list to go is through a reputable list broker. He does all the promoting for you, and handles everything, more or less sending you a check - minus his 10-15% commission - at the end of each month.
This is definitely the kind of business you can set up on almost any home computer, and so long as you keep the "nixies" to a bare mailing list minimum, you can realize an unbelievable income. If you're promoting/renting your own list, you should set up a working relationship with either a copy shop of lease/buy your own photocopy machine.