Determing price point for rentals based on current rent prices

[John Collins]

Is there a tool (or paid service) that allows me to see all the rental values in the nearby area? Not the listed "for rent" prices, but the rents for homes with actual tenants in them. Other info such as how long the home was on the market before renting would be fine. 

Is this referred to as MLS comps? I am trying to make it more convenient for me to gather this info.

As of now I go through zillow and click manually on each home to look at it's price history to help me determine this information.