I've tried googling some historical data on rent prices and it seems that they stayed steady, even during 2008-2009. 

The key to either of them is to have targeted data of motivated or distressed sellers.

Hi all, New data from Bright for June 2011.

Hello all, My wife and I are about purchasing a single family home that built 10 years ago, which listed for ~5,400 sqft, I noticed that based on floor plan, it is under 4000 sqft, and although I applied maximum home ...

@Miguel Horta appraisers make mistakes and are often willing to up the value if you present a good argument with comps/market data.

Sure, you can find skip traces out there that are 4 cents per record but you end up getting bad data or 9+ numbers that you have to sift through to determine if they're the right person or not; often times the phone number/contact will be information that was correct years ago.

Hello All,I am looking for referrals on sources, readings, data, etc on how to increase your rental property value after purchase.

The $123/SF is based on what the county will allow me to use to based my estimate to determine if I will be above or below the 30k, based on some data they have available.

And when you manually sift through the rental data you can screen out the slop which invests time to achieve maximum accuracy.To evaluate for a single property address what I would do is go to realtor.com (which directly sources from the MLS), hit the rent tab, put the county of the property you're evaluating, and go to map view for a zillow-like view of what rentals are actually listed at what rent price. 

I think OpenDoors will have more and better data than Bigger pockets, but, good luck.