Good old fashion door knocking.  Not to sell, to leave behind an invite.  It's personal, intriguing, and depending on your product(s), it's a no brainer.  It takes a little bit of writing and design skills but works!  Be prepared, do tests of about 50 to 100 a month.  Do your research so you're not wasting a lot of time.  Research on your targets.  Make everything personal.  Good luck!