I've been investing for a few years now, Eric, and I've implemented all of the following advertising methods, (I've also hired people to do many of these for me):  direct mail, bandit signs, car magnets, posters, flyers, card drops, t-shirts, door knocking, cold calling, cinema ads, craigslist posts, email alerts, and online ads.  

Magnetic Sign on your car11.

I am planning on making a door hanger and using them in one school district, in the areas where I am looking to buy.The contents:Basics: Clear bag, magnetic (or regular) biz card, handwritten note or mini card, flyer printed on matte cardstock.Other possibilities: A card (with small magnet attached) that shows community calendar and my info, small coupon book from local businesses that may want to participate (this could help pay for this campaign also).I plan to follow this up in a month or two with a sticky note on each door that says, "Hi- We buy houses in as-is condition in (this area).

All rankings: #909 in National Rankings #25 in North Carolina High Schools #134 in Magnet High Schools 6-12Grades 1,639Total Enrollment15:1Student-Teacher Ratio 2018 Rankings Durham School of the Arts is ranked #909

If you don't have kids in school that might make it easier otherwise you will find  magnet school options. 

Even San Antonio ISD has some great magnet schools.  

It's a small tear-off calendar with a magnet and sticker on the back so the client can put it on their refrigerator or their desk.

Awesome info I like the idea of a magnet, less likely to trash it! 

As if we are still in the magnet tape world when it comes to data transfers. 

...there was one shot when the "flipper" drove in the driveway to "keep on top of" the workers - and on the passenger side door of his SUV was a magnetic sticker that read "wwwhabitationrealtycom".