Looking for best online resources to find properties with more than 4 units.  Any suggestions?

If you want "true" sales data, get your county data sets and do primary research. realtor.com is a web site owned by Move, Inc., which was acquired by News Corp.

After reading about the HouseFlippingSpreadSheet on J Scott's web site I am thinking about buying it since I am planning on doing my first rehab next year.J's recommendation goes a long way IMO but I was curious if anyone else has any suggestions or advise about this product or any other similar products they use and recommend.

I found out that it was due to the web browser I was using. 

Some counties web sites are more user friendly than others you may have to look at a tax parcel map and search by the parcel in the search function.  

I would use a large one since they often can give you a login access to do your own searches via the web (I use Chicago Title).

(You can't see their ratings on their web site unless you pay.) 

Question:  So why the mobile app when you already have essentially the same thing through a web browser but with the added functionality of multiple tabs/pages to manage at once? 

I haven't even done an MLS search yet but I'm planning to do that this week just to compare between they and Zillow as we all know how unreliable Z can be.http://www.zillow.com/homes/for_sale/San-Diego-CA/fore_lt/pmf,pf_pt/54296_rid/33.168594,-116.416626,32.46806,-117.785798_rect/9_zm/

You are correct, there are numerous highlights I can mention like: I've never lost money on a buy, I've bought a $500 web property and sold it for $4,000 in the span of a month, and I've currently bought a property for $4,000 that I plan to sell for $10,000+ in the next few months.