Actual Rent Data for Listings?

[Josh L.]

How do you find the actual rent data, ie how much a rental actually rented out for and not what it was listed for?

I'm pulling old comps, but the problems is that just because something gets listed and asks for a certain rent does not mean the landlord actually ended renting it out for that amount.

The landlordology blog made a interesting point when it wrote:

"When a real estate agent “pulls comps” to evaluate a home for sale, they use actual sales, not listings prices. Actual rent prices will inform you of what landlords in your neighbor are actually receiving in rent, not just what they hope to receive."

https://www.landlordology.com/...

Is there any way to find the actual rent data than to pay $20 to landlordology for their report? 

And, if anybody has used it, how accurate is their report? How are they able to find the actual rent prices?