Most have option to download their entire database which is usually about 800K names into Excel.From there it's relatively easy to sort and get rid of 99.9% of the names.  

How can I find a database of foreclosure properties, probate & Non-owner occupied (Absentee owner) properties .

Failure to do so enables the tenant to plead ignorance of the law as a defense."

It gives you the marketing power of a 40 character message and clickable link on EVERY Bluetooth enabled Android device within 300 feet.Take it with you and passively generate leads.

I've been selling commercial full time for almost a year and am struggling getting off the ground - I am building a solid database (from 0) of industry professionals (buyers/sellers/brokers/wholesalers etc), doing lead gen daily, and finding quite a few pocket listings.

Never heard of a consolidated database of all counties, but that would be cool.

Here is some price information from our event (geographical areas may differ in pricing):"Database price for labor to hang ½” taped, floated, and ready for paint $1.06/SFHeavy Texture, ready for paint 1.22/SFSmooth Wall finish 1.55/SFReady for Texture .90/SFUnfinished, hung only .54/SF"There is normally a 10 to 15% increase in labor prices the insurance companies give you in a disaster. 

Not sure what the licensing differences are but you may need a commercial license to access that database or work though a commercial broker.

What other options do I have other than List Source, or should I just continue to build my own database?  

I didn't realize you posted right away since I didn't have notifications enabled.