They even have a MLS keyword tool that scrapes MLS listings for motivated seller keywords. 

It's great to have you here.Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/m...Set up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/a...Read Beginner’s Guide: http://www.biggerpockets.com/r...Check out BP Money Podcast: https://www.biggerpockets.com/..

People do a search for a keyword and your PPC ad comes up.Here is the problem with this.  

Set up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsI hope BP serves as a helpful resource for your REI endeavors!

Also, you can search "assumable" as a key word in Zillow to see some of these listings yourself. 

@Teho KimZillow tip: You can key word search for this.

Particularly be sure to include your goals for real estate investing so that folks can help you. 2) Follow your favorite forum topics and set up keyword alerts!

Particularly be sure to include your goals for real estate investing so that folks can help you. 2) Follow your favorite forum topics and set up keyword alerts!

Particularly be sure to include your goals for real estate investing so that folks can help you. 2) Follow your favorite forum topics and set up keyword alerts!

@Justin SegarraThere are a handful of us here in the forum that House Hack MTR by the room on FF (and other sites) and the informative conversations are sprinkled throughout, so I recommend doing a keyword search here.