Facebook and other media seem so untapped.  

You can also buy lists from companies like list source and there are some REI software companies that have a cash buyer search feature.Best way to find motivated sellers is to purchase lists and compile lists from city and county for 60-90-120 days late on mortgage, pre-foreclosure, delinquent taxes, water cutoff, code violation, probate, divorce, high equity, etc. and mail or cold call.Other methods are driving for dollars, door knocking, wholesalers, craigslist, Realtors, FSBO sites, expired listings, foreclosure sites, put out bandit signs, billboards, newspapers, other offline publications.You can use pay per click/adwords, facebook, Linkedin, Youtube, and other forms of online and social media marketing.Once you have a large enough budget you can do TV and radio as well.You could letter up or wrap your vehicle.

We store all our clothing on shelves in a large bathroom.

Make money at self employed business (retail store) where I work with my wife as well.

(Go look at a new outlet at the hardware store to see.)  

I mostly want to buy a duplex in a way where if tenants leave I won't get stuck paying to store or dispose of their stuff.

You can do it via social media blogs, videos or in person by presenting at REI events or hosting your own.

Taxes in Chicago are cheaper and there are great neighborhoods despite what the media portrays.

Try to get yourself noticed on all social media places and know how to use them. 

I also do free prescreening of verifying employment, calling prior landlords, and open source internet of social media and state/county criminal court systems.