How about a quick post card? Placed like Vista Print and 4overinc can print custom post cards quite cheaply. Cost for postage is less than a letter, but still more than email.
I have no problems sending post cards to customers, most don't mind a solicitation in the mail. Email is a whole 'nuther story though. It's a matter of trust between us. I don't have it written on my site, but if I ever talk to anyone, I tell them I only send email as a matter of followup or business, not advertising. If they want advertising, they can "opt into" my contest.
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